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John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 60 miles per hour, what is v in miles per hour?
A. 30
B. 40
C. 50
D. 55
E. 70
The OA is A.
Lets take Total Distance as 100 miles.
First Lap => 80 miles at 80 mph => Time = 1 hour
Second Lap => 20 miles at v mph => Time = 20/v
Avg Speed = Total Dist / Total Time
60 = 100 / (1 + 20/v)
v = 30 mph.
Please, can anyone explain another way to solve this PS question? Thanks!
A. 30
B. 40
C. 50
D. 55
E. 70
The OA is A.
Lets take Total Distance as 100 miles.
First Lap => 80 miles at 80 mph => Time = 1 hour
Second Lap => 20 miles at v mph => Time = 20/v
Avg Speed = Total Dist / Total Time
60 = 100 / (1 + 20/v)
v = 30 mph.
Please, can anyone explain another way to solve this PS question? Thanks!
