Three pipes A , B and C takes 15, 24 and 36 minutes respectively to fill a tank. Pipe D can empty it in 1 hour. If all the four pipes are kept open then find the time taken to fill the tank.
(A)
(B)
(C)
(D)
3x2 = 36 then what is the value of x?
(A)
(B) 3
(C)
(D)
The price of one eraser is Rs. 3. The value of 20 eraser is equal to the value of three Pens. The value of one pen is equal to the value of two pencils and the value of six pencils is equal to the value of five markers. What is the value of one marker?
(A) Rs. 9
(B) Rs. 12
(C) Rs. 13.50
(D) Rs. 15
A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and the stream are 10 km/hr and 4 km/hr respectively, the distance of the destination from the starting place is :
(A) 21 km
(B) 25 km
(C) 16 km
(D) 18 km
A boat rows downstream covers a distance of 20 km in 2 hrs while it covers the same distance upstream in 5 hrs. Then speed of the boat in still water is :
(A) 9 km/ hr
(B) 10 km/ hr
(C) 7 km/ hr
(D) 8 km/ hr
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