Question
Ratio of speed of boat in downstream and speed of stream
is 9:5, if speed of current is 10 km/hr, then find distance travelled (in km) upstream in 6 hours.Solution
Let speed of downstream and speed of stream be 9x and 5x respectively. Speed of current => 5x = 10 => x = 2 km/hr Downstream speed = 9 × 2 = 18 km/h Speed of boat = 18 - 2 = 16 km/hr Upstream speed = 16 - 2 = 14 km/h Distance travelled upstream in 6 hr = 14 × 6 = 84 km
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