Question

1) What is the length of the bridge which a man running 15km/hrs can cross in 5 min.
2) How long will a man take to walk 600 m,if he walks at the rate of 4km/hrs.

Answer 1

1) speed =15km/hr
time taken =5 min
distance = speed x time
=15*5
=75
the is 75 m

2) distance =600m
speed=4km/hr
time =distance/speed
= 600/4
=150 min

Answer 2

s=d/t
15 = d/5/60
15= d/1/12
15=12d
d=15/12
d=5/4
d=1.25 kms
2. s=d/t
4×5/18= 600/t
10/9 =600/t
1/9= 60/t
t=9*60
t=540sec