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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
The mean of 5 observations is 12. If a new observation of value 18 is added, what is the new mean?
A13
B14
C15
D16
Find the perimeter of a sector of a circle with radius 14 cm and central angle 90°. (Use pi = 22/7)
A22 cm
B36 cm
C50 cm
D64 cm
Find the standard deviation of the numbers: 3, 5, 7, 9, 11.
A2.0
B2.83
C4.0
D8.0
If the area of a circle is 154 cm², find its circumference. (Use pi = 22/7)
A22 cm
B33 cm
C44 cm
D66 cm
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 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