Soution of a man walks at the speed of 7 km/hr and runs at the speed of 56 km/hr. How much time will the man require to cover the distance of 28 km, if he covers half (first = 14 km) his journey walking and half of his journey running?
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Simple, add 14/7 (=2 hrs) and 14/56 (=15mins) and get the answer as 2hrs 15mins .
NOTE: BE CAREFUL ABOUT UNITS...
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