1] A man can row downstream at 14 kmph and upstream at 9 kmph.Man's rate in still water is
a]5 kmph b]23 kmph c] 11.5 kmph d] none

rate in still water is = (1/2)(14+9) = 23/2 = 11.5 kmph

2] A man can row upstream at 7 kmph and downstream at 10 kmph.Man's rate in still water is
a]5 kmph b]23 kmph c] 8.5 kmph d] none

3] If a man can swim downstream at 6 kmph and upstream at 2 kmph.Man's rate in still water is
a]5 kmph b]23 kmph c] 4 kmph d] none

4] A man can row upstream at 11 kmph and upstream at 16 kmph.Man's rate in still water is
a]5 kmph b]23 kmph c] 13.5 kmph d] none

5] In one hour a boat goes 11km along the stream and 5 kmph against the stream.The speead of the boat in still water is
a]5 kmph b]23 kmph c] 11.5 kmph d] none