Question
A boat covers 90 km downstream and 70 km upstream in a
total time of 10 hours. How much time will it take to travel 126 km downstream and 98 km upstream?Solution
Let speed of boat in downstream and upstream be ‘x’ km/h and ‘y’ km/h respectively.
So, 90/x + 70/y = 10
And, 126/x + 98/y = 1.40 × (90/x + 70/y) = 1.4 × 10 = 14 hours
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