A police van at 30 km/h fires a bullet (muzzle speed 150 m/s) at a thief's car going at 192 km/h in same direction. Speed of bullet relative to thief's car is:
A boat is moving with a velocity of 3î + 4ĵ m/s with respect to the ground. The water in the river is flowing with a velocity of -3î - 4ĵ m/s with respect to the ground. The relative velocity of the boat with respect to the water is:
Two balls are thrown toward each other from positions 100 m apart. Ball A moves at 20 m/s and Ball B at 30 m/s in opposite directions. Time for them to meet is:
A thief starts running at 8 m/s. A policeman starts chasing after 4 s at 10 m/s. Time taken by policeman to catch the thief after he starts running is:
A boat takes 2 hours to travel 8 km upstream and 8 km downstream in a river. If the speed of the river current is 2 km/h, the speed of the boat in still water is:
