A long distance runner runs 9 laps of...

A long distance runner runs 9 laps of a 400 metres track every day. His timings (in min) for four consecutive days are 88, 96, 89 and 87 respectively. One and average, how many metres/minute does the runner cover? `17. 78` b. `40` c. `90` d. none of these

39 m/min

40 m/min

41 m/min

43 m/min

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