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Alan drove from city A to city B at an average speed
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Updated on: 10 Jul 2020, 11:22
Updated on: 10 Jul 2020, 11:22
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Question Stats:
63% (01:57) correct
36% (01:00) wrong based on 19 sessions
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Alan drove from city A to city B at an average speed of 50 miles per hour and returned back along the same route at an average speed of 60 miles per hour. If the total driving time of the journey was 11 hours, how many minutes did Alan take to drive from city B to city A?
A. 5
B. 6
C. 50
D. 300
E. 360
A. 5
B. 6
C. 50
D. 300
E. 360
Re: Alan drove from city A to city B at an average speed
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10 Jul 2020, 11:22
10 Jul 2020, 11:22
Expert Reply
A to B average speed of 50 m/h
B to A average speed of 60 m/h
Total time - 11 hours
Time for B to A?
Total distance is 2D
Total Average speed will be (2*50*60) /(50+60) -->
600/11
Time taken from B to A will be
11= 2D*11/600
D = 300
Therefore time taken with speed of 60m/h and distance of 300 m will be 300/6 = 5 hrs
Or 300 minutes.
Here how to use the timer and the official answer https://gre.myprepclub.com/forum/how-to-po ... tml#p32033
Regards
B to A average speed of 60 m/h
Total time - 11 hours
Time for B to A?
Total distance is 2D
Total Average speed will be (2*50*60) /(50+60) -->
600/11
Time taken from B to A will be
11= 2D*11/600
D = 300
Therefore time taken with speed of 60m/h and distance of 300 m will be 300/6 = 5 hrs
Or 300 minutes.
Here how to use the timer and the official answer https://gre.myprepclub.com/forum/how-to-po ... tml#p32033
Regards
Re: Alan drove from city A to city B at an average speed
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05 Dec 2023, 10:44
05 Dec 2023, 10:44
Forward trip
d= 50(11-t)
Backward trip
d = 60t
60t = 550-50t
110t=550
t= 5h or 300 mins Answer D
Adewale Fasipe, GRE quant instructor from Nigeria.
d= 50(11-t)
Backward trip
d = 60t
60t = 550-50t
110t=550
t= 5h or 300 mins Answer D
Adewale Fasipe, GRE quant instructor from Nigeria.
