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The maximum speed that a particular truck can travel is 80 mph. Tim dr

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The maximum speed that a particular truck can travel is 80 mph. Tim dr  [#permalink]

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New post 22 Jul 2019, 01:13
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Question Stats:

73% (02:13) correct 27% (02:22) wrong based on 66 sessions

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The maximum speed that a particular truck can travel is 80 mph. Tim drives that truck on a long highway stretch of 280 miles. The first 120 miles stretch of the highway has a speed limit of 60 mph, whereas the rest of the distance speed limit is 90 mph. If Tim always remain within the speed limits and never drops below 40 mph, then which of the following could be the possible time taken by Tim to travel the entire journey?

I. 4 hours 20 minutes
II. 5 hours 30 minutes
III. 6 hours 45 minutes

A. I only
B. II only
C. I and II only
D. I and III only
E. I, II and III

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Re: The maximum speed that a particular truck can travel is 80 mph. Tim dr  [#permalink]

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New post 22 Jul 2019, 02:49
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Bunuel wrote:
The maximum speed that a particular truck can travel is 80 mph. Tim drives that truck on a long highway stretch of 280 miles. The first 120 miles stretch of the highway has a speed limit of 60 mph, whereas the rest of the distance speed limit is 90 mph. If Tim always remain within the speed limits and never drops below 40 mph, then which of the following could be the possible time taken by Tim to travel the entire journey?

I. 4 hours 20 minutes
II. 5 hours 30 minutes
III. 6 hours 45 minutes

A. I only
B. II only
C. I and II only
D. I and III only
E. I, II and III



Given: The maximum speed that a particular truck can travel is 80 mph. Tim drives that truck on a long highway stretch of 280 miles. The first 120 miles stretch of the highway has a speed limit of 60 mph, whereas the rest of the distance speed limit is 90 mph. Tim always remain within the speed limits and never drops below 40 mph.
Asked: Which of the following could be the possible time taken by Tim to travel the entire journey?

For first 120 miles
Speed varies from 40 mph to 60 mph
Time travelled varies from 2 hours to 3 hours

For next 160 (280-120) miles
Speed varies from 40 mph to 80 mph
Time travelled varies from 2 hours to 4 hours

Time taken by Tim to travel the entire journey varies from 4 hours to 7 hours

I. 4 hours 20 minutes POSSIBLE
II. 5 hours 30 minutes POSSIBLE
III. 6 hours 45 minutes POSSIBLE

IMO E
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Re: The maximum speed that a particular truck can travel is 80 mph. Tim dr  [#permalink]

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New post 22 Jul 2019, 06:03
Max time in which he can reach (When speed in the lowest possible @ 40) = 280/40=7 hrs
Min time in which he can reach (When speed in the lowest possible @ 60 for 120 and 80 for 160)=2 hrs+ 2 hrs = 4 hrs
So all combinations in between is possible
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Re: The maximum speed that a particular truck can travel is 80 mph. Tim dr  [#permalink]

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New post 30 Jul 2019, 09:43
Bunuel wrote:
The maximum speed that a particular truck can travel is 80 mph. Tim drives that truck on a long highway stretch of 280 miles. The first 120 miles stretch of the highway has a speed limit of 60 mph, whereas the rest of the distance speed limit is 90 mph. If Tim always remain within the speed limits and never drops below 40 mph, then which of the following could be the possible time taken by Tim to travel the entire journey?

I. 4 hours 20 minutes
II. 5 hours 30 minutes
III. 6 hours 45 minutes

A. I only
B. II only
C. I and II only
D. I and III only
E. I, II and III


First, let’s use the maximum rates to determine the minimum time, which equals distance/rate for each part of the trip:

120/60 + 160/80 = 2 + 2 = 4 hours

Next, let's use the minimum rate to determine the maximum time, noting that he will travel at 40 mph for the entire distance.

280/40 = 7 hours

Thus, I, II, and III are all possible.

Answer: E
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Re: The maximum speed that a particular truck can travel is 80 mph. Tim dr   [#permalink] 30 Jul 2019, 09:43
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