# Boats and Streams

## Boats and Streams

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 Question 1
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
 A 2 hours B 3 hours C 4 hours D 5 hours
Question 1 Explanation:
Speed downstream = (13 + 4) km/hr = 17 km/hr. Time taken to travel 68 km downstream = 68/17hrs = 4 hrs.
 Question 2
A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:
 A 8.5 km/hr B 9 km/hr C 10 km/hr D 12.5 km/hr
Question 2 Explanation:
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr. Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.
 Question 3
In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
 A 3 km/hr B 5 km/hr C 8 km/hr D 9 km/hr
Question 3 Explanation:
Speed in still water =(1/2)*(11 + 5) kmph = 8 kmph.
 Question 4
A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?
 A 4 km/hr B 6 km/hr C 8 km/hr D Data inadequate
Question 4 Explanation:
Rate downstream =16/2kmph = 8 kmph. Rate upstream = 16/4kmph = 4 kmph. Speed in still water = (1/2)*(8 + 4) kmph = 6 kmph.
 Question 5
The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:
 A 1.2 km B 1.8 km C 2.4 km D 3.6 km
Question 5 Explanation:
Speed downstream = (15 + 3) kmph = 18 kmph. Distance travelled =(18 x(2/60))km = 3.6 km.
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There are 5 questions to complete.