A rectangular field is 72 m by 58 m. Keya walks around it at the rate of 3 km per hour. How long will she take to make 3 rounds?

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Solution

Length of one round =2(72+58) = 260m
total length of three rounds = 3(260) = 780m = 0.78 km
Time to make three rounds = $\frac{d i s t a n c e}{s p e e d}$
= $\frac{0.78}{3}$
15.6min

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