Advertisements
Advertisements
प्रश्न
A can do a piece of work in 20 days and B in 15 days. They worked together on it for 6 days and then A left. How long will B take to finish the remaining work?
Advertisements
उत्तर
Given,
A can do a piece of work in = 20 days
B can do a piece of work in = 15 days
∴ A's 1-day work =`1/20`
B's 1-day work = `1/15`
(A+B)'s 1-day work =`1/20+1/15`
`=(3+4)/60=7/60`
(A+B)'s 6 days work =`7/60xx6=7/10`
Remaining work =`1-7/10`
`=(10-7)/10=3/10`
B can do 1 work in = 15 days
B can do `3/10` work in =`15xx3/10` days
`=45/10`days =`9/2` days = `4 1/2` days
APPEARS IN
संबंधित प्रश्न
22 men can dig a 27 m long trench in one day. How many men should be employed for digging 135 m long trench of the same type in one day?
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?
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?
72 men do a piece of work in 25 days. In how many days will 30 men do the same work?
If 56 workers can build a wall in 180 hours, how many workers will be required to do the same work in 70 hours?
A fort had provisions for 450 soldiers for 40 days. After 10 days, 90 more soldiers come to the fort. Find in how many days will the remaining provisions last at the same rate?
90 men can complete a work in 24 days working 8 hours a day. How many men are required to complete the same work in 18 days working `7 1/2` hours a day?
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 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?
P alone can do `1/2` of a work in 6 days and Q alone can do `2/3` of the same work in 4 days. in how many days will they finish `3/4` of the work, working together?
