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A train travels 100 km in 2 hours and 150 km in 3 hours. What is its speed?
A50 km/h
B60 km/h
C75 km/h
D100 km/h
A boat goes 15 km downstream in 3 hours and 12 km upstream in 4 hours. What is the stream speed?
A0.5 km/h
B1 km/h
C1.5 km/h
D2 km/h
A father is now four times as old as his son. After 16 years he will be twice as old as his son. What is the son’s present age?
A6 years
B10 years
C8 years
D12 years
