Numerical Ability

A thief runs at 8km/h. Police start chasing 30 min later at 10km/h. Find the time for police to catch the thief.

A man rows 6km/h in still water; river flows at 2km/h. Find the time to row 20km each way (round trip).

A car travels 90km/h for 2 hours and 60km/h for 3 hours. Find the average speed.

Excluding stoppages, a train's speed is 60km/h; including stoppages it is 50km/h. Find the stoppage time per hour.

In a 100m race, A wins by 10m with a speed of 5m/s. Find B's speed.

Two trains, 150m and 120m, run in the same direction at 60km/h and 42km/h. Find the time to cross.

A man walking at 4km/h reaches his office 10 min late; at 5km/h he is 10 min early. Find the distance.

A train's speed is 5/3 times a car's speed. The car covers 360km in 4 hours. Find the train's speed.

A man travels 60km at 20km/h and returns at 30km/h. Find the total time.

A train reduces its speed by 20%, taking 15 minutes more for a fixed distance. Find the usual time.

Speed downstream = 15km/h, upstream = 9km/h. Find the speed in still water.

Speed downstream = 15, upstream = 9. Find the current speed.

Boat speed in still water = 10km/h, current = 4km/h. Find the downstream speed.

Boat speed in still water = 10, current = 4. Find the upstream speed.

A boat covers 24km upstream in 6 hours and returns in 4 hours. Find the still-water speed and current speed.

A man rows 18km downstream in 3 hours and returns in 6 hours. Find the speed of the stream.

A boat covers 32km downstream in 4 hours; stream speed is 2km/h. Find the still-water speed.

A man rows 7.5km/h in still water; in a river flowing at 1.5km/h, it takes him 50 min to row to a place and back. Find the distance.

Speed of a boat in still water is 15km/h, stream speed is 5km/h. Find the time to go 60km downstream.

A boat's downstream speed is thrice its upstream speed; still-water speed is 12km/h. Find the stream speed.

A man rows to a place 48km away and back in 14 hours, rowing 4km with the stream in the same time as 3km against it. Find the stream speed.

A boat covers 100km downstream in 10 hours and the same distance upstream in 20 hours. Find the stream speed.

In one hour, a boat goes 11km along the stream and 5km against it. Find the boat's still-water speed.

Using the same data (11km with, 5km against, in 1 hour), find the stream speed.

A man rows at 5km/h in still water; the river flows at 1km/h, and a round trip takes 1 hour. Find the distance.