Question

Hey! Please help me solve it. I have a test so please explain it ASAP​

Answer 1

Given:

A man walks at the speed of 4 km/hr. A train coming from behind here at 22 km/hr passes by him in 30 sec.

To find:

The length of the train.

Solution:

Man’s speed = $\mathtt{4kmn^{-1}}$

Train’s speed = $\mathtt{22kmn^{-1}}$

» Relative speed of train w.r.t man

$\implies{\sf{22 - 4}}$

$\implies{\sf{18kmn^{-1}}}$

$\implies{\sf{\frac{5}{18} × 18}}$

$\implies{\red{\sf{5kmn^{-1}}}}$

» Length of train = 5 × 30

Hence, the length of the train is 150m

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Hope it helps!