Question
If the speed of the current is 4 km/hr and the ratio of
the speed of the boat in downstream to the speed of the stream is 7:2, what is the distance travelled (in km) upstream in 4 hours?Solution
Let the speed of downstream and speed of stream be 7x and 2x respectively. Speed of current => 2x = 4 => x = 2 km/hr Downstream speed = 7 × 2 = 14 km/h Speed of boat = 14 - 4 = 10 km/hr Upstream speed = 10 - 4 = 6 km/h Distance travelled upstream in 4 hr = 6 × 4 = 24 km
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