Question
A captain can navigate a ship at a speed of 5 km/hr in
calm waters. With a current moving at a speed of 3 km/hr, he takes 12 hours longer to travel 'd' km upstream compared to traveling the same 'd' km downstream. Determine the value of '2d'.Solution
we can say that, Upstream speed of the Ship = 5 – 3 = 2 km/hr Downstream speed of the Ship = 5 + 3 = 8 km/hr ATQ, (d/2) – (d/8) = 12 Or, 4d – d = 12 × 8 Or, d = 96/3 = 32 Therefore, 2d = 64 km
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