Question
A, B, and C together wrap up a task in 14 days. B and C
together can finish it in (280/18) days, and C alone completes half in 14 days. Find the ratio of the efficiency of A to B.Solution
1/A + 1/B + 1/C = 1/14 C alone complete the whole work = 14 × 2 = 28 days B and C together = (280/18) days ⇒ rate = 18/280 = 9/140 1/A = 1/14 – 9/140 = (10 – 9)/140 = 1/140 1/B = 9/140 – 1/28 = (9 – 5)/140 = 4/140 = 1/35 A alone complete the work = 140 days B alone complete the work = 35 days Required ratio = (1/140) : (1/35) = 1 : 4
Paras starts chasing a Vipin, 5 hours after the Vipin starts running. Paras takes 6 hours to catch the Vipin. If the average speed of the Paras is 22 km...
Ajay and Vishal left the place ‘X’ with different speeds which are in the ratio 9:4 respectively. Ajay left the place 30 seconds after Vishal. If af...
Ajay and Vishal left the place ‘X’ with different speeds which are in the ratio 7:6 respectively. Ajay left the place 36 seconds after Vishal. If af...
A man travels a specific distance at a given speed, completing the journey in a set amount of time. If he had reduced his speed by 10 km/h, it would hav...
The average speed of a bus is half the speed of a train. The train covers 5200 km in 13 hours. How much distance will the bus cover in 36 minutes?
A train passes two people who are walking in the opposite direction of the train at the rates of 4 m/s and 10 m/sec in 12 seconds and 10 seconds respect...
A boy goes to school at 10 km/Hr and return at a speed of 9 km/hr. If he takes 19 hrs in all. Find the distance from his village to school?
Sheetal rides a bike at an average speed of 40 kmph and reaches her destination in 5 hours. Hemlata covers the same distance in 4 hrs. If Sheetal increa...
What is the length of the bridge which a man riding 21 km an hour can cross in 3 min.?
- Two runners ‘A’ and ‘B’, which were 600 km apart, started running towards each other at the same time and met after 4 hours. If the speed of runner...
