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Average age of 3 men is 25. If their ages are in ratio 3:5:7, find the age of the youngest.
A10
B15
C20
D25
A man can row 10 km/h in still water and the stream is 2 km/h. How long will it take to row 24 km downstream?
A2 hours
B2.5 hours
C3 hours
D4 hours
A boat goes 16 km upstream and 24 km downstream in 6 hours. If the stream speed is 2 km/h, find the speed of the boat in still water.
A8 km/h
B10 km/h
C12 km/h
D14 km/h