Question

A train,240m long crosses a mam walking along the line in opposite direction at the rate of 3km/h in 10sec.the speed of the train is?​

Answer 1

Answer:

The speed of the train 24 metres per second

Answer 2

Given that,

• Length of train = 240 m

• Speed of man = 3 km/h

• Time taken = 10 seconds

• Let speed of train be x km/h

We know that;

$\bf \: relative \: speed \: = \frac{length \: of \: train}{time \: taken} \\ \\ = \sf(x + 3) \frac{ \frac{240}{1000} }{ \frac{10}{60 \times 60} } \\ \\ \sf = \frac{24 \times 60 \times 60}{100 \times 10} \\ \\ = \sf(x + 3) = 86.4 \\ \\ \sf \red{⇒ x = 83.4}$

Hence the speed of the train is 83.4 km/h.

I HOPE IT HELPS.