Question

A train 400m long is running at a speed of 40km/h.How long will it take to cross 400m long?​

Answer 1

Answer:

${\huge{\underline{\underline{Question}}}}$

A train 400m long is running at a speed of 40km/h.How long will it take to cross 400m long?

${\huge{\underline{\underline{Answer}}}}$

${\underline{Given}}$

A 400 m train is running at a speed of 40km/h.

${\underline{To\ find}}$

Time taken by train to cross 400 m distance.

${\underline{Solution}}$

Total distance that is to be covered by train=its length+distance to be covered

=400+400

=800m

We already know that speed=40km/h.

Convert the speed into m/s=$40×\frac{5}{18}$

=$\frac{200}{18}$

=$\frac{100}{9}$

$\boxed{Time=\frac{distance}{speed}}$

So,here time taken=$\frac{800}{\frac{100}{9}}$

=$\frac{800×9}{100}$

=$\frac{7200}{100}$

=72 seconds

=1 min 12 sec is answer.

Answer 2

Answer:

thanks for the free points