A man can row 9 km/h in still water and he finds that it takes him twice as much time to row up than to row down the same distance. Find the speed of the current.
Explanation:
Let speed of current be c. Downstream speed = 9 + c, Upstream speed = 9 - c. Since time is twice for upstream, speed must be half: 9 - c = (9 + c) / 2 => 18 - 2c = 9 + c => 3c = 9 => c = 3 km/h.
Explanation:
Let total distance be 100 km. First segment = 30 km; Time = 30 / 15 = 2 hours. Second segment = 70 km; Time = 70 / 35 = 2 hours. Total distance = 100 km, Total time = 4 hours. Average speed = 100 / 4 = 25 km/h.
A car covered a distance of 400 km at a uniform speed. If the uniform speed index is lowered by 10 km/h, the journey takes 2 hours longer. Find the original speed.
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