A hollow cylindrical tube open at both ends is made up of Iron 3 centimetre take if the external diameter is 56 cm and the length of the tube is 182 cm find the number of cubic centimetre in it
A boat goes 16 km upstream and 24 km downstream in 6 hr. Also it cover 12 km upstream and 36 km downstream in same time. Find the speed of the boat in still water and that of the stream
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