17. If a boat goes 7 km upstream 42 minutes and the speed of the stream is 3 kmph then the speed of the boat in still water is:
(A) 2.4 km/hr
(B) 8 km/hr
(C) 13 km/hr
(D) 12 km/hr
18. If a man rows at the rate of 5 kmph in still water and his rate against the current is 3.5 kmph, then the man’s rate along the current is :
(A) 5.35 kmph
(B) 7.2 kmph
(C) 6.5 kmph
(D) 8.5 kmph
(E) None of these
19. The speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is
(A) 17 hours
(B) 19 hours
(C) 21 hours
(D) 24 hours
20. A man can row at 5 kmph in still water. If the velocity of the stream is 1 kmph and it takes him 1 hours to row to a place and come back, how far is the place?
(A) 2.4 km
(B) 2.6 km
(C) 2.8 km
(D) 3 km
21. A man can row
(A)
(B)
(C)
(D)
22. A motorboat whose speed is 15km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:
(A) 1
(B) 5
(C) 15
(D) 10
23. A boat takes 90 min less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is :
(A) 2 mph
(B) 4 mph
(C) 6 mph
(D) 8 mph
24. A boat covers 24 km upstream and 36 km downstream in 6 hours while it covers 36 km upstream and 24 km downstream in
(A) 0.5 km/hr
(B) 1.5 km/hr
(C) 2 km/hr
(D) 3.5 km/hr
25. A man can row
(A) 3
(B) 6
(C) 2
(D) 4
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