how long will a man take to cover a distance of 7km by working 4km per hour
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Step-by-step explanation:
he covers 4 km in 1 hr
he covers 1km in 1/4 hr
he will cover 7 km in = 1/4 ×7 = 7/4 hr or 7/4 ×60 min = 105 min
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