Question
X and Y together complete a job in 18 days, while Y
alone can do it in 30 days. The ratio of efficiencies of X and Z is 4:5 respectively. What is the ratio of efficiencies of Y and Z?Solution
ATQ,
Let total work = 90 units {LCM of 18 and 30}
Efficiency of (X + Y) = 90/18 = 5 units/day
Efficiency of Y = 90/30 = 3 units/day
Therefore, efficiency of X = 5 – 3 = 2 units/day
Efficiency of Z = 2 × (5/4) = 2.5 units/day
Required ratio = 3 : 2.5 = 6 : 5
A boy goes to school at 9 km/Hr and return at a speed of 8 km/hr. If he takes 17 hrs in all. Find the distance from his village to school?
A train passes Peter who is walking at the speed of 2 km/h in the direction in which the train is moving. Peter can see the train for 15 minutes and 12 ...
John cycles to the gym at 10 km/h and returns at 8 km/h. He spends a total of 4 hours and 30 minutes traveling. What is the distance between his home an...
A train covers a distance of 84 km at the speed of 42 km/h the next 45 km distance covers with a speed of 30 km/h and last 60 km with the speed of 40 km...
A vehicle was scheduled to complete a 360 km journey in 6 hours. For the initial 4 hours, it maintained a steady speed of 56 km/h. At what minimum speed...
- Ravi and Mohan start walking on a circular path simultaneously in the same direction. Ravi walks at 12 m/s, while Mohan walks at 18 m/s. If the track is 60...
A bus takes 90 minutes to cover 135 km. If its speed is reduced by 15 km/h, find the new time required to cover the same distance.
John cycles at 10 km/h to reach his destination at 2 PM. If he travels at 15 km/h, he will reach at 12 noon itself. At what speed should he travel to re...
A circular track is 1760 m long. Two runners start from the same point in opposite directions at speeds 9 km/h and 11 km/h. After how much time will the...
Amrit and Rohan were traveling from point A to point B. Amrit took 72 minutes longer than Rohan to reach point B. Their respective speeds were 50 km/h a...
