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A long distance runner run 9 laps of a 400 metres track everyday. His timings (in min) for four consecutive days are 88, 96, 89 and 87 respectively. On an average, how many metres/minutes does the runner cover ?
Answer & Solution
Correct Answer:
Option
B
$$\eqalign{
& {\text{Average speed :}} \cr
& = \frac{{{\text{Total distance covered }}}}{{{\text{Total time taken}}}} \cr
& = \left( {\frac{{4 \times 9 \times 400}}{{88 + 96 + 89 + 87}}} \right){\text{m/min}} \cr
& = \left( {\frac{{14400}}{{360}}} \right){\text{m/min}} \cr
& = 40{\text{ m/min}} \cr} $$
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