Description
A pedestrian averages 3 mi/h on the streets of Manhattan, and a subway train averages 30 mi/h. If each city block is 1/20 of a mile, how many more minutes than the subway train does it take for a pedestrian to travel 60 blocks in Manhattan?
Explanation & Answer
Pedestrian speed = 3 mph
Subway train = 30 mph
differential = 27 mph
Each block =0.05 mile
60 blocks = 60*0.05 = 3 miles
Subway train covers in 3/30 =1/10 = 6 minutes
Pedestrian covers in 6 minutes =6/60*3 miles =0.3 miles.
He has to cover 2.7 miles more.
It will take the pedestrian = 2.7/3*60 = 54 minutes.
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