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Time taken by all 3 bells to ring together = L.C.M of 28, 60 and 84 = 420 seconds 10 minutes = 10 X 60 = 600 seconds 600 ÷ 420 ~ 1.42 So, the three bells will ring together only once in the given interval of 10 minutes.
A man travels a certain distance at 12 km/h and returns to the starting point at 9 km/h. The total time taken by him for the entire journey 2 (1/3) hour...
A was travelling from point X to point Y. He increased his speed by 4 km/h after every hour. He reached his destination in 8 hours. If his initial speed...
A worker is paid ₹500 for 8 hours of work. If he works for 6 hours overtime at 1.5 times his regular hourly rate, what will be his total pay for 14 ho...
The speed of a train is 54 km/hr and it takes 10 seconds to cross a man. Find the time taken by train to cross a platform if the ratio of the length of ...
A motor-cycle covers 60 km with a speed of 20 km/hr. find the speed of the motor-cycle for the next 60 km journey so that the average speed of the whole...
If a car runs at 30 km/hr, it reaches its destination late by 15 minutes but if runs at 45 km/hr it is late by 7 minutes. What is the correct time for t...
A car travels at a speed of 90 km/h and takes 4.5 hours to cover a specific distance. A train can cover the same distance in 3 hours. If the speed of th...
A man covered a distance of 240 km in 4 hours on a bike. How much distance will he cover on a bicycle in 8 hours if he rides the bicycle at one-tenth th...
Two friends start running on a circular track of 900 metres in opposite directions. One runs at 18 m/s and the other at 27 m/s. When will they first be ...
