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If 15 workers can build a wall in 48 hours, how many workers are needed to build it in 30 hours?
A20
B24
C25
D30
A mixture of milk and water is in ratio 3:2. If there are 30 liters in total, how much water must be added to make the ratio 2:3?
A10L
B15L
C20L
D25L
The length and breadth of a rectangle are 12m and 8m. If the length is increased by 25%, find the new area.
A96
B110
C120
D130
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