Question

A train of length 120m travels at a speed of 57km/h in what time it will pass a man who is walking atv3km/h in the opposite direction

Answer 1

VA is the velocity of the train = 57 km/hr
VB is the velocity of the man = 3 km/hr
relative velocity is VAB = VA _ (_VB) = 57+3 =60 convert to km to m
60×5÷18 =16.66
we have to find time
V= d/t

t=d/v =120/16.66=7.2sec

Answer 2

The answer is 7.2 seconds

Explanation:

Length of the train = 120m

Speed of the train = 57km/h = $\frac{95}{6}$m/s

Velocity of the man = $\frac{5}{6}$m/s

Time = $\frac{distance}{velocity}$

= 120 ÷ $\frac{95}{6}$ - (-$\frac{5}{6}$)

= 7.2 seconds