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Abhi077
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12 Dec 2020, 10:18
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
54% (03:17) correct
46%
(03:20)
wrong
based on 176
sessions
History
Date
Time
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Not Attempted Yet
During a certain trip, Matt traveled y percent of the total distance at an average speed of 48 miles per hour. He traveled one-third of the remaining distance at 40 miles per hour and the rest at 60 miles per hour. The average speed of Matt for the entire trip can be
A. 50 miles per hour
B. 52 miles per hour
C. 54 miles per hour
D. 56 miles per hour
E. 28 miles per hour
A. 50 miles per hour
B. 52 miles per hour
C. 54 miles per hour
D. 56 miles per hour
E. 28 miles per hour
12 Dec 2020, 10:57
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let total distance=600 miles
Y=40% = 240 miles @ 48 MPH
1/3 of rest= 120 miles @ 40 mph
balance = 240 miles @ 60 MPH
total time = 240/48 + 120/40 + 240 /60 = 12 hours
average speed = 600/12 = 50 MPH
Answer = A
Y=40% = 240 miles @ 48 MPH
1/3 of rest= 120 miles @ 40 mph
balance = 240 miles @ 60 MPH
total time = 240/48 + 120/40 + 240 /60 = 12 hours
average speed = 600/12 = 50 MPH
Answer = A
02 Jun 2021, 20:43
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We don't need to pay attention to y. Look carefully in the second part : 1/3 distance with 40 mph, 2/3 with 60mph. We can easily calculate the average speed for the whole second part by assuming this distance equal a multiple of 3, for example 120, and you will get 51.5. wow. From that, we know, the average speed of all the trip is between 48mph and 51.5 mph. So A is the only option could be correct ! Nguyễn Phúc Hưng đẹp trai 😁
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