Boats and Streams
Congratulations - you have completed Boats and Streams.
You scored %%SCORE%% out of %%TOTAL%%.
Your performance has been rated as %%RATING%%
Your answers are highlighted below.
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.
Question 1 Explanation:
Speed downstream = (13 + 4) km/hr = 17 km/hr. Time taken to travel 68 km downstream = 68/17hrs = 4 hrs.
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:
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.
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:
Question 3 Explanation:
Speed in still water =(1/2)*(11 + 5) kmph = 8 kmph.
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?
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.
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:
Question 5 Explanation:
Speed downstream = (15 + 3) kmph = 18 kmph. Distance travelled =(18 x(2/60))km = 3.6 km.
Once you are finished, click the button below. Any items you have not completed will be marked incorrect.
There are 5 questions to complete.