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If the ratio of speed of boat in downstream and speed of stream is 9 : 1, speed of current is 3 km per hr, What would be the distance travelled in upstream by the boat in 5 hours?

90 km
97 km
115 km
105 km
Explanation:

Ratio of speed of boat in downstream and speed of stream is 9 : 1


Given Speed of current = 3 km/ h


Speed of boat in downstream = 9 × 3 = 27 km/h


Speed of boat in still water = Speed of boat in downstream – Speed of current


= 27 – 3 = 24 km/h


Speed of boat in upstream = 24 – 3 = 21 km/h


Distance travelled by boat in upstream in 5 hours = 21 × 5 = 105 km

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