App Logo

No.1 PSC Learning App

1M+ Downloads
A boy can swim in still water at a speed of 10 km/hr. If the speed of the current would have been 5 kmph, then the boy could swim 60km

Aupstream in 4 hour

Bdownstream in 12 hours

Cupstream in 6 hours

Ddownstream in 4 hours

Answer:

D. downstream in 4 hours

Read Explanation:

Given:

Still Water Speed = 10 kmph

Speed of Current = 5kmph

Distance = 60 km

Calculation:

Rate downstream = 10 + 5 = 15 kmph

Rate upstream = 10 – 5 = 5 kmph

Time taken in swimming 60km downstream

=6015=4hours=\frac{60}{15}=4hours

15 = 4 hours

Time taken in swimming 60km upstream

=605=12hours=\frac{60}{5}=12hours

From, given options, boy can swim 60km downstream in 4 hrs.


Related Questions:

A rowing team rows a boat and covers a distance of 15 km in 5 hours while going upstream. When they go downstream, they cover a distance of 24 km in 4 hours. Find the speed of the boat in still water?
A motor-boat, travelling at the same speed, can cover 25 km upstream and 39 km downstream in 8 hours. At the same speed, it can travel 35 km upstream and 52 km downstream in 11 hours. The speed of the stream is
A man can row 24km/hr in still water. It takes twice as long to travel any distance upstream as compared to the same distance downstream. Find the speed of the stream?
The total time by the boat to cover 72 km upstream and 180 km downstream in 16 hours. The total time taken by the same boat to cover 108 km upstream and 126 downstream in 16 hours. If the sum of the upstream speed and downstream speed of the boat is 30 km, then find the speed of the stream.
A boat can travel 27 km in one hour in still water and travels the same distance against the stream in 90 minutes. How much time will the boat take to travel 90km in the direction of stream?