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The speed of a boat in still water in 17 km/h and the rate of current is 4 km/h. The distance travelled upstream in 540 seconds is:


1. 1550 m
2. 1950 m
3. 1850 m
4. 2090 m
5. 2260 m

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Correct Answer - Option 2 : 1950 m

Given:

Speed of boat in still water = 17 km/h

Speed of the stream = 4 km/h

Time taken = 540 seconds

Formulas Used:

Speed = Distance/Time

1 km = 1000 meter

S(upstream) = S(boat in still water) - S(stream)

Calculation:

S(upstream) = S(boat in still water) - S(stream)

⇒ S(upstream) = (17 – 4)

⇒ S(upstream) = 13 km/hr

Speed = Distance/Time

⇒ Distance = Speed x Time

⇒ Distance = 13 x (540/3600) = 1.95 km = 1950 meter

The distance travelled downstream is 1950 meter.

Conversion of Time from seconds to hours

1 second = (1/3600) hour 

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