Q : If a boat goes upstream at a speed of 24 km/hr and comes back the same distance at 40 km/hr. What is the average speed (in km/hr) for the total journey?
(A) 32
(B) 30
(C) 31
(D) 33
A man rows to a place 35 km in distance and back in 10 hours 30 minutes. He found that he can row 5 km with the stream in the same time as he can row 4 km against the stream. Find the rate of flow of the stream?
(A) 1.33 km/hr
(B) 1.5 km/hr
(C) 1 km/hr
(D) 0.75 km/hr
If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is :
(A) 4 hr
(B) 7 hr
(C) 2 hr
(D) 3 hr
A man can row at a speed of
(A) 2
(B) 2.5
(C) 1
(D) 1.5
A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the stream are 10 km/hr and 4 km/hr respectively, the distance of the destination from the starting place is :
(A) 21 km
(B) 25 km
(C) 16 km
(D) 18 km
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