Advertisements
Advertisements
Question
A can do a piece of work in 10 days and B in 15 days. How long will they take together to finish it?
Advertisements
Solution
A's 1-day work =`1/10`
B's 1-day work =`1/15`
(A + B)'s 1-day work =`1/10+1/15`
`=(3+2)/30=5/30`
`=1/6`
∴ Both A and B together can finish the work in = 6 days
APPEARS IN
RELATED QUESTIONS
A train is moving with a uniform speed of 120 km per hour.
(i) How far will it travel in 36 minutes?
(ii) In how much time will it cover 210 km?
36 men can do a piece of work in 7 days. How many men will do the same work in 42 days?
In a fort 150 men had provisions for 45 days. After 10 days, 25 men left the fort. How long would the food last at the same rate?
A car takes 6 hours to reach a destination by travelling at a speed of 50 km per hour. How long will it take when the car travels at a speed of 75 km per hour?
If 15 men can complete a piece of work in 30 days, in how many days will 18 men complete it?
Twelve typists, all working with the same speed, type a certain number of pages in 18 days working 8 hours a day. Find, how many hours per day must sixteen typists work in order to type the same number of pages in 9 days?
A and B working together can mow a field in 56 days and with the help of C, they could have mowed it in 42 days. How long would C take by himself?
A can finish a piece of work in 15 days and B can do it in 10 days. They worked together for 2 days and then B goes away. In how many days will A finish the remaining work?
A can do a piece of work in 10 days, B in 12 days, and C in 15 days. All begin together but A leaves the work after 2 days and B leaves 3 days before the work is finished. How long did the work last?
Two pipes P and Q would fill an empty cistern in 24 minutes and 32 minutes respectively. Both the pipes being opened together, find when the first pipe must be turned off so that the empty cistern maybe just filled in 16 minutes.
