A boat travels 24 km upstream in 6 hours and 20 km downstream in 4 hours. Then the speed of boat in still water and the speed of current are respectively.
(A) 4 kmph and 3 kmph
(B) 4.5 kmph and 0.5 kmph
(C) 4 kmph and 2 kmph
(D) 5 kmph and 2 kmph
A man swims downstream distance of 15 km in 1 hour. If the speed of the current is 5 km/ hr, the time taken by the man to swim the same distance upstream is :
(A) 1 hr 30 min
(B) 45 min
(C) 2 hr 30 min
(D) 3 hrs
The LCM of two multiples of 12 is 1056. If one of the numbers is 132, the other number is
(A) 96
(B) 132
(C) 12
(D) 72
A number which when divided by 10 leaves remainder of 9, when divided by 9 leaves a remainder of 8, and when divided by 8 leaves a remainder of 7, is:
(A) 359
(B) 1359
(C) 1539
(D) 539
A solid cube, whose diagonal is
(A) 16 cm
(B) 25.6 cm
(C) 20.8 cm
(D) 16.4 cm
If a cube whose side is 7.5 cm, what will be its volume?
(A)
(B)
(C)
(D)
Two numbers are in the ratio x : y . If 2 is added to both numerator and denominator , the fraction becomes
(A) 2
(B) 3
(C) 4
(D) 5
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