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A train covers a distance of 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less. What was the original speed?
A35 km/h
B40 km/h
C45 km/h
D50 km/h
A tank can be filled by Pipe A in 5 hours and Pipe B in 10 hours, while Pipe C empties it in 20 hours. If all three are opened together, how long to fill the tank?
A4 hours
B4.4 hours
C5 hours
D5.5 hours
Find the standard deviation of the numbers: 3, 5, 7, 9, 11.
A2.0
B2.83
C4.0
D8.0
Find the value of k for which the quadratic equation 2x^2 + kx + 3 = 0 has real and equal roots.
A±2*sqrt(6)
B±3*sqrt(2)
C±4
D±6
A boat travels 24 km upstream in 4 hours and 36 km downstream in 3 hours. What is the speed of the current?
A2 km/h
B3 km/h
C4 km/h
D5 km/h