Question

A runner takes 6 minutes 40 seconds of cross a platform of length 800 metres. The speed of the runner is (B)2 m/s (A) 80 m/s (C) 4 m/s (D) 40 m/s​

Answer 1

(B) 2m/s

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

• distance of platform = 800 m

• time taken to complete = 6 minute 40 s

$\bf\huge\underline{\underline{ To \: Find:- }}$

• speed of runner

$\bf\huge\underline{\underline{ Answer :- }}$

• distance = 800 m

• time = 6 minute 40 second = 400 s

• $\boxed{ \bf\red{ Speed = \frac{Distance }{ time }}}$

• $\bf Speed = \frac{800 }{ 400 }$

• $\bf Speed = 2 m/s$

$\rule{10cm}{0.05cm}$

The speed of runner = 2 m/s

Answer 2

Total time = 6 minute 40 s

= 400 s

length = 800 m

speed of runner = 800 / 400

= 2 m/s

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