Question

(1
7. A train of 150 m length is going towards North at
a speed of 36 km/h. A bird is flying at 18 km/h
parallel to track towards South. Find the time
taken by the bird to cross the train.
(3
3. If​

Answer 1

${\red{\underline{\underline{\bold{Question:-}}}}}$

A train of 150 m length is going towards North at a speed of 36 km/h. A bird is flying at 18 km/h parallel to track towards South. Find the time taken by the bird to cross the train ?

${\green{\underline{\underline{\bold{Solution:-}}}}}$

Given :-

• Distance = 150m

To Find:-

• Time taken by the bird

Explanation:-

➵ Bird and Train are moving in opposite directions.

➵ Speed of the train = 36 km/h

$➜ \: 36 \times \frac{5}{18} \\ ➜ \: 10 \: m/s$

➵ Speed of the bird = 18 km/h

$➜18 \times \frac{5}{18} \\ ➜ \: 5 \: m/s$

➵ Relative Speed of train with respect to the flying bird = (10 + 5) = 15 m/s

➵ Time taken by the bird to cross the train =

$➵ \: \frac{150}{15} \\ ➵ \: \fbox{10 \: sec}$