Question

The speed of the train is 72 km per hour. Find its speed in metre per second.

Answer 1

Answer:

20 m/s

Step-by-step explanation:

72×5/18

=4×5

=20 m/s

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Answer 2

Answer:

$\large{\underline{\boxed{\sf 20 \: m/s. }}}$

Step-by-step explanation:

Given that ;

Speed of the train is 72 km/hr.

To change it into metre/seconds, there is method.

Simply multiply it with $\sf \dfrac{5}{18}$ .

⇒$\sf 72 * \dfrac{5}{18}$

⇒ 4 * 5

⇒ 20 m/s.

Hence, the answer is 20 m/s.

Well, one question must be arising here that, why we have multiplied with $\sf \dfrac{5}{18}$ .

Answer is, because we know that ;

• 1 km = 1000 m
• 1 hr = 3600 secs

Therefore,

$\implies 72 \times \frac{1000}{3600} \\ \\ \implies 72 \times \frac{5}{18} \\ \\ \implies \bf 20 \: ms {}^{ - 1}$

$\rule{300}{2}$

∴ The speed of the train in metre per second is 20 m/s.