Question

a man walk at a speed at 54 kmph. he covers a distance of 90 m in

Answer 1

Convert Km/h to m/s. Then solve by unitary method.

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Answer 2

Answer:

option C is correct.

Step-by-step explanation:

The speed of a man is given as=$54\frac{km}{hr}=54{\times}\frac{5}{18}ms^{-1}=15ms^{-1}$.

Distance covered by a man=90m, then by using the formula:

$Speed=\frac{distance}{time}$,

$15=\frac{90}{t}$

$t=\frac{90}{15}$

$t=6seconds$

Therefore, time taken= 6 seconds.

Thus, option C is correct.