Arithmetic

Time, Speed & Distance

Easy

applied

A man rows 24 km upstream in 6 hours and 36 km downstream in 6 hours each time, then the speed of the boat in the still water is

5 km/hr

1 km/hr

6 km/hr

4 km/hr

✅ Correct Option: 1

Distance upstream = 24 km

Time taken = 6 hours

Upstream speed = $\frac{\text{Distance}}{\text{Time}}$

Upstream speed = $\frac{24}{6}$

Upstream speed = $4$ km/hr

Distance downstream = 36 km

Time taken = 6 hours

Downstream speed = $\frac{36}{6}$

Downstream speed = $6$ km/hr

The speed of the boat in still water is the average of upstream and downstream speeds.

Speed in still water = $\frac{\text{Upstream speed + Downstream speed}}{2}$

Speed in still water = $\frac{4 + 6}{2}$

Speed in still water = $\frac{10}{2}$

Speed in still water = $5$ km/hr

Therefore, the speed of the boat in still water is $5$ km/hr.

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2025: 26 May Shift 2

A boat covers a distance 24 km upstream and returns to the same point in a total of 4 hours. If the speed of boat in downstream is twice its speed in upstream, then the speed of boat in upstream is:

A man rows 24 km upstream in 6 hours and 36 km downstream in 6 hours each time, then the speed of the boat in the still water is

Solution

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