Question

A train of length 120m travels at a speed of 57km/h in what time it will pass a man who is walking at 3km/h in opposite direction

Answer 1

Explanation:

$length \: of \: train \: = 120 \: m \\ relative \: speed \: = speed \: of \: train \: + speed \: of \: man \: = 57 + 3 \: km/h = 60 \times \frac{5}{18} m/s = \frac{50}{3} m/s (since \: the \: train \: is \: running \: in \: opposite \: direction \: the \: relative \: speed \: will \: be \: sum \: in \: speed)\\ time \: taken \: to \: cross \: man \: = \frac{120}{ \frac{50}{3} } = \frac{120 \times 3}{50} = \frac{36}{5} = 7.2 \: sec$

Answer 2

Answer:

the answer is 7.2 hopebit helps