Question
Solution
Let the distance be x, then, Upstream speed = 21(3/2)km/h - 12.5 km/h ⇒ 22.5 - 12.5 ⇒ 10 km/h Downstream speed = 22.5 km/h + 12.5 km/h = 35 km/h According to the question, (x/10) + (x/35) = 40/60 ⇒x(1/10 + 1/35) = 2/3 ⇒x(45/350) = 2/3 ⇒x = (2 × 70)/(3 × 9) x = 5(5/27) km
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