The wheels revolve round a common horizontal axis. They make 15, 20 and 48 revolutions in a minute respectively. Starting with a certain point on the circumference down wards. After what interval of time will they come together in the same position?

Related Mcqs:

1. Three men start together to travel the same way around a circular track of 11 kilometers in circumference. Their speeds are 4, 5 and 8 kilometers per hour respectively. When will they meet at a starting point?

   A. 11 hours
   B. 12 hours
   C. 220 hours
   D. 22 hours

2. A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting point?

   A. 26 min 18 sec
   B. 42 min 36 sec
   C. 45 min
   D. 46 min 12 sec

3. Jameel gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Nasir gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross?

   A. 19
   B. 28
   C. 30
   D. 37

4. The parameter of a square is equal to the perimeter of a rectangle of length 16 cm and breadth 14 cm. Find the circumference of a semicircle whose diameter is equal to the side of the square. (Round off your answer to two decimal places)?

   A. 23.57 cm
   B. 47.14 cm
   C. 84.92 cm
   D. 94.94 cm

5. Five bells first begin to toll together and then at intervals of 5, 10, 15, 20 and 25 seconds respectively. After what interval of time will they toll again together?

   A. 5 min
   B. 5.5 min
   C. 5.2 min
   D. None

6. Two pipes A and B can separately fill a tank in 12 and 15 minutes respectively. A third pipe C can drain off 45 liters of water per minute. If all the pipes are opened, the tank can be filled in 15 minutes. What is the capacity of the tank?

   A. 480 liters
   B. 540 liters
   C. 600 liters
   D. 675 liters

7. Two pipes can fill a tank in 20 and 24 minutes respectively and a waste pipe can empty 3 gallons per minute. All the three pipes working together can fill the tank in 15 minutes. The capacity of the tank is?

   A. 60 gallons
   B. 100 gallons
   C. 120 gallons
   D. 180 gallons

8. Rs.8000 become Rs.9261 in a certain interval of time at the rate of 5% per annum of C.I. Find the time?

   A. 4 years
   B. 6 years
   C. 2 years
   D. 3 years

9. A man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey?

   A. 8 kmph
   B. 4 kmph
   C. 2 kmph
   D. 10 kmph

10. A and B started business in partnership investing Rs. 20,000 and Rs. 15,000 respectively. After six months, C joined them with Rs. 20,000. What will be B’s share in the total profit of Rs. 25,000 earned at the end of 2 years from the starting of the business?

    A. Rs. 7500
    B. Rs. 9000
    C. Rs. 9500
    D. Rs. 10,000
    E. None of these