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# If the speed of a vehicle was reduced from 65 miles per hour to 35 mil

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Math Expert
Joined: 02 Sep 2009
Posts: 58434
If the speed of a vehicle was reduced from 65 miles per hour to 35 mil  [#permalink]

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27 Nov 2018, 00:29
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Difficulty:

45% (medium)

Question Stats:

68% (01:47) correct 32% (02:02) wrong based on 118 sessions

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If the speed of a vehicle was reduced from 65 miles per hour to 35 miles per hour, by approximately how many kilometers per hour was the speed reduced? (1 kilometer = 0.62 mile, rounded to the nearest 0.01 mile)

A. 16
B. 22
C. 40
D. 48
E. 56

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Re: If the speed of a vehicle was reduced from 65 miles per hour to 35 mil  [#permalink]

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27 Nov 2018, 10:27
Bunuel wrote:
If the speed of a vehicle was reduced from 65 miles per hour to 35 miles per hour, by approximately how many kilometers per hour was the speed reduced? (1 kilometer = 0.62 mile, rounded to the nearest 0.01 mile)

A. 16
B. 22
C. 40
D. 48
E. 56

(65)/.62- (35)/.62
= ~ 48 IMO D
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Re: If the speed of a vehicle was reduced from 65 miles per hour to 35 mil  [#permalink]

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27 Jan 2019, 18:10
65-35 = 30 mph
30/0.62= ~48kmph.
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Re: If the speed of a vehicle was reduced from 65 miles per hour to 35 mil  [#permalink]

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06 Mar 2019, 08:12
Bunuel wrote:
If the speed of a vehicle was reduced from 65 miles per hour to 35 miles per hour, by approximately how many kilometers per hour was the speed reduced? (1 kilometer = 0.62 mile, rounded to the nearest 0.01 mile)

A. 16
B. 22
C. 40
D. 48
E. 56

Initial speed = 65 miles/hr

Reduced speed = 35 miles/hr

Difference in speed = 65 - 35 = 30 miles/hour

1 km = 0.60 miles approx

1 mile = 1/0.60 km

Therefore,

30 * 1 * 100 / 60 = 50 kms approx

So D = 48 kms is the closest choice

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Re: If the speed of a vehicle was reduced from 65 miles per hour to 35 mil  [#permalink]

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08 Mar 2019, 07:58
Bunuel wrote:
If the speed of a vehicle was reduced from 65 miles per hour to 35 miles per hour, by approximately how many kilometers per hour was the speed reduced? (1 kilometer = 0.62 mile, rounded to the nearest 0.01 mile)

A. 16
B. 22
C. 40
D. 48
E. 56

We see that 220 yards is 220/1760 = 22/176 = 11/88 = 1/8 miles.

Thus, the number of hours it will take to travel 1/8 miles at 45 mph is:

(1/8)/45 = 1/(45 x 8) = 1/360 hours, which is (1/360) x 3600 = 10 seconds

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Re: If the speed of a vehicle was reduced from 65 miles per hour to 35 mil   [#permalink] 08 Mar 2019, 07:58
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