1. A man can row downstream at the rate of 12 Km/hr and upstream at 6 Km/hr. Find man's rate in still water and the rate of current? 


2. A man can row 14 Kmph in still water. It takes him twice as long to row up as to row down the river. Find the rate of stream? 


3. A man rows down stream 40 km and upstream 21 km taking 4 hrs each time. what is the velocity of current? 


4. A man can row 12 Kmph in stil water and the river is running at 4 Kmph. If the man takes 2 hour to row to a place and back how far is the place? 


5. A man can row downstream at the rate of 32 Kmph and upstream at 8 Kmph. Find the man’s rate in still water and rate of current? 


6. A man can row 36 kmph in still water. It takes him thrice as long to row up as to row down the river. Find the rate of the stream? 


7. In a stream running at 3 Kmph, a motor boat goes 10 Km upstream and back again to the starting point in 57 minutes. Find the speed of motor boat in still water? 


8. In an hour a boat goes 10 Km along the stream and 4 Km against the stream. The speed of the boat in still water (in Kmph) is: 


9. The greatest number of four digits which is divisible by 21, 35, 49 and 63 


10. Find the greatest number that will divide 54, 87 and 172 so as to leave the same remainder in each case 


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