How many minutes does Aditya take to cover a distance of 400 m, if runs at a speed of 20 kmph?
A). 60 seconds
B). 72 seconds
C). 80 seconds
D). 82 seconds
72 seconds
Aditya's speed = 20 kmph = 20 x 5/18 m/sec = 50/9 m/sec
Time taken to cover 400 m = (400 x 9/50) sec = 72 sec.