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?
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
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