Find the surface area of the smallest cube that can perfectly fit a sphere of volume 972π cm3 inside it.
Let the radius of the sphere be 'R' cm. 972π = (4/3) x π x R3 Or, 729 = R3 So, R = 9 So, length of edge of the cube = 9 x 2 = 18 cm Required area = 6 x 182 = 1944 cm2
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A boat covers 45 km downstream in 2 h and the same distance upstream in 10 h. Find the speed (in km/h) of the boat in still water.
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The ratio of the speed of boats ‘A’ and ‘B’ in still water is 8:9, respectively. The speed of the current is 25% of the speed of boat ‘A’ in...
A boy can swim in water with a speed of 10 km/hr in still water. If the speed of the stream is 4 km/hr, what will be the time taken by the boy to cover ...
A ferry takes 108 minutes to row to place B from another place A along the stream. The distance between place A and place B is 32.4 km. If the speed of ...
The respective ratio between the time taken by a boat to travel the same distance downstream in stream A and that in stream B is 7 : 5. The speed of the...
Speed of a boat in still water to speed of boat in upstream is 7:5. If the boat can travel 360 km in downstream in 5 hours, then find the time taken by ...
The speed of current is 10 km/hr. If the speed of the boat in still water had been 8 km/hr more than the original speed, then it would take 7 hours to c...
