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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

Read Solution (Total 2)

Speed downstream = (13 + 4) km/hr = 17 km/hr.

Time taken to travel 68 km downstream = (68/17)hrs = 4 hrs.
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After replacing an old member by a new member, it was found that the average age of five members of a club is the same as it was 3 years ago.What is the difference between the ages of the replaced and the new member?
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B. 4 years
C. 8 years
D. 15 years The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is
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