DBF/19
D-10
41. A boat can be rowed 9 km. upstream or
18 km. downstream in a period of 3 hrs. What is the
speed of the boat in still water in km/hr?
(A) 4 km/hr
(B) 4.5 km/hr
(C) 3 km/hr
(D) 3.5 km/hr
AL
42. Two pipes can seperately fill a tank in
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