Question

how long will you take to run 6 round a circular ground of diameter 140m with the mean speed of 5m/s ?​

Answer 1

Given:

• Diameter = 140m and radius = 70m
• Speed = 5 m/s
• Rounds = 6

To Find:

• how long will it take to run

Solution:

$\sf \: Speed = \frac{2\pi \: r}{t}$

$\sf \: 5 = \frac{2 \times \frac{22}{ \cancel{ \: 7 \: }1} \:\times \cancel{ \: 70 \: } \: 10}{t} \\ 5 = \frac{440}{t} \\ t = \frac{440}{5} \\ \\ \boxed{ \sf \: time = 88 \: seconds}$

$\bf \: 88 \: seconds \sf \: will \: we \: take \: to \: run \: \: \\ \sf \: round \: a \: circular \: ground \: of \\ \sf \: diameter \: 140m \: with \: the \: mean \: \\ \sf \: speed \: of \: 5m/s$

Now according to 6 rounds we will require total 6 × 88 = 528 seconds

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