Question

5. a rectangular field is 90 m by 70 m. a man walks around it at the rate of 4 kilometre per hour. what time will he take in making 1 round?​

Answer 1

Given, length of rectangular field = 90 m

and breadth = 70 m.

Distance covered by man in completing 1 round along the rectangular field = perimeter of rectangular field

= 2(l + b) = 2 (90 m + 70 m) = 320 m

∴ distance covered by the man in completing 4 rounds = 4 × 320 m = 1280 m = 1.28 km

Also, speed with which man walks = 4 km/hr

Time taken by man in completing 4 rounds = Distance/speed

= 1.28/4

= 0.32 hour

= 0.32 × 60 minutes = 19.2 minutes

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Answer 2

Answer:

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