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If a car covers a distance of 300 km in 5 hours, what is its speed in m/s?
A12.5 m/s
B15 m/s
C16.67 m/s
D20 m/s
A cistern has two pipes. Pipe A fills it in 8 hours and Pipe B empties it in 12 hours. If both are opened together, how long to fill the cistern?
A16 hours
B20 hours
C24 hours
D30 hours
A wheel has a radius of 21 cm. How many revolutions will it make to cover a distance of 1320 cm?
A5
B10
C15
D20
If the circumference of a circle is 88 cm, find its radius. (Use pi = 22/7)
A7 cm
B14 cm
C21 cm
D28 cm
A man walks at 5 km/h for 2 hours and then runs at 10 km/h for 1 hour. What is his average speed?
A6.67 km/h
B7.5 km/h
C8.0 km/h
D8.33 km/h
A boat goes 16 km downstream in 2 hours and 16 km upstream in 4 hours. What is the speed of the boat in still water?
A4 km/h
B6 km/h
C8 km/h
D10 km/h