Question

A train which is 150m long is moving towards south at a speed of 10 m per sec. A parrot flies towards north with a speed of 5 m per sec. In what time the parrot cross the train.​

Answer 1

Answer:

10sec.

Explanation:

relative velocity is(10+5)=15m per sec.

15m is being covered by a train in 1sec

1 m is being covered by a train in 1÷15sec

150 m is being covered by a train in (1÷15)×150=10sec.

Answer 2

$\huge{\bold{\underline{\underline{....Answer....}}}}$

$\huge{\bold{\underline{Given:-}}}$

S = 150 m.

Velocity of train = $\large{v_a = 10 \: m\ s}$

Velocity of bird = $\large{v_b = 5 \: m\ s}$

$\huge{\bold{\underline{Explanation:-}}}$

Relative velocity :-

As the both parrot and train are moving in opposite direction

Then, There velocity will be added.

$\large{V_r = 10 + 5}$

$\large{V_r = 15 m/s}$

As, we know

$\large{\bold{Distance = Speed \times Time}}$

$\large{\bold{Time = \frac{Distance}{Speed}}}$

Substituting the values.

$\large{T = \frac{150}{15}}$

Simplifying

$\large{T = 10 \: Seconds}$

$\huge{\boxed{\boxed{T = 10 \: Seconds}}}$

So,the parrot cross the train in 10 seconds.