A rectangular field is 72m by 58m. 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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Length of one round =2(72+58) = 260m
total length of three rounds = 3(260) = 780m = 0.78 km
Time to make three rounds =
speed
distance
=
3
0.78
15.6min
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