295. A river is flowing at the rate of 8 km/h. A swimmer swims across the river with a velocity of 10 km/h
w. r.t. water. The resultant velocity of the man will
be in (km/h):-

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.