a man can walk distance of 5 km in 3/2 hours. how much time will be needed by him to cover a distance of 7 km if the work at the same period?
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man takes for 5km walk=3/2hours(1.5 hours)
man takes for 1km walk=3/2÷5
=3/2×1/5
=3/10
=0.3hours
man takes for 7km work=7×0.3
=2.1hours
=21/10hours
hence a men takes for 7km work=21/10hours
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