Exams › SSC CGL (Prelims) › Maths
A boat covers a distance of 55 km downstream in 5 hours, while it takes 11 hours to cover the same distance upstream. What is the speed of the boat in still water?
- 8 km/h
- 9 km/h
- 11 km/h
- 7 km/h
Correct answer: 8 km/h
Solution
Downstream speed = $55/5=11$ km/h and upstream speed = $55/11=5$ km/h. Speed of the boat in still water is $\frac{11+5}{2}=8$ km/h.
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