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Boat can do a round trip of 88 km (44 km to and fro) in 12 hours. If ratio of boat speed to stream speed is 3 ∶ 1, Find stream speed (in km/hr)
1. 2.25
2. 2.5
3. 2.75
4. 3.25
5. 3.5

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Correct Answer - Option 3 : 2.75

Given:

Time for 44 km round trip = 12 hours.

Ratio of boat speed to stream speed = 3 : 1

Formula:

Speed = Distance/Time

Downstream speed = u + v

Upstream speed = u – v

u and v are speed of boat and stream respectively

Calculation:

Let speeds of boat and stream be 3x and x respectively.

44/(3x – x) + 44/(x + 3x) = 12

44/2x + 44/4x = 12

132/4x = 12

x = 2.75 km/hr

∴ The speed of stream is 2.75 km/h.

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