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A train 200 m long crosses a platform 300 m long in 25 seconds. What is the speed of the train in km/h?
A60 km/h
B72 km/h
C80 km/h
D90 km/h
If 15 workers can build a wall in 20 days, how many workers are needed to build the same wall in 12 days?
A20
B22
C25
D30
If the radius of a circle is doubled, by what factor does its area increase?
A2 times
B3 times
C4 times
D8 times
What is the average of the prime numbers between 10 and 20?
A13.5
B14.25
C15
D15.25
If tan(theta) = 1, what is the value of theta in degrees?
A30°
B45°
C60°
D90°
A pole 6 m high casts a shadow 2*sqrt(3) m long. What is the angle of elevation of the sun?
A30°
B45°
C60°
D75°
If 15% of x is equal to 20% of y, what is the ratio x:y?
A3:4
B4:3
C3:5
D5:3