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Let the speed of the stream be 'x' km/h. Original time taken to cover the journey = (630/60) = 10.5 hours So, time taken to cover the first half of the journey = 10.5 ÷ 2 = 5.25 hours Time taken to cover the second half of the journey = 5.25 hours - 15 minutes = 5 hours So, speed of the boat in second half of the journey = (315/5) = 63 km/h So, net change in speed = 63 - 60 = 3 km/h So, 1.25x - x = 3 Or, 0.25x = 3 So, 'x' = 12 Therefore, speed of the steam = 12 km/h
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