Question
On Thursday, difference between time taken by the boat
to cover ‘X’ km upstream and (X+100) km downstream is 20 hours. Had the boat covered same distance upstream as downstream, what would be the difference in time taken then? Study the following table carefully and answer the given questions: Distance Upstream = Distance Downstream Total time taken = Downstream time + Upstream timeSolution
Downstream speed = 12 + 8 = 20 km/hr Upstream speed = 12 - 8 = 4 km/hr According to question, => X/4 – (X+100)/20 = 20 => 4X = 500 => X = 125 km Downstream distance = 125 + 100 = 225 km Required time = 225/4 – 225/20 = 45 hrs Â
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