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Ratio of speed of boat in down stream and speed of stream is 9:1, if speed of current is 3 km per hr, then find distance travelled(in km) upstream in 5 hours.

1. 105
2. 110
3. 120
4. 90

Correct answer: 105

Solution

Downstream:stream = 9:1. Stream = 3 km/hr → Downstream = 9×3 = 27 km/hr. Still water speed = downstream - stream = 27-3 = 24 km/hr. Upstream speed = still water - stream = 24-3 = 21 km/hr. Distance in 5 hours = 21×5 = 105 km. Note: original source had '90' as answer which is incorrect. Correct answer is 105.

Related IBPS PO Quantitative Aptitude questions

• A boat covers 28 km downstream and, while returning, covers only 75% of the downstream distance. If the boat takes 3 hours more to cover the upstream journey than the downstream journey, and the speed of the stream is \(5/9\) m/s, find the speed of the boat in still water.
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