If the ratio of speed of boat in downstream and speed of stream is 4:1, speed of current is 5 km per hr, What would be the distance travelled in upstream by the boat in 2 hours?
Ratio of speed of boat in downstream and speed of stream is 4 : 1 Given Speed of current = 5 km/ h Speed of boat in downstream = 4 × 5 = 20 km/h Speed of boat in still water = Speed of boat in downstream – Speed of current = 20 – 5 = 15 km/h Speed of boat in upstream = 15 – 5 = 10 km/h Distance travelled by boat in upstream in 2 hours = 10 × 2 = 20 km
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