Advertisements
Advertisements
Question
A and B working together can do a piece of work in 10 days B alone can do the same work in 15 days. How long will A alone take to do the same work?
Advertisements
Solution
A and B working together can do a piece of work in 10 days
and B alone can do the same work in 15 days
A and B's one day's work = `1/10`
and B's one day's work = `1/15`
∴ A's one day's work = `1/10 - 1/15`
`= (3 - 2)/30 = 1/30`
Hence A can do the same work in = 30 days
APPEARS IN
RELATED QUESTIONS
A train covers 51 km in 3 hours. Calculate its speed. How far does the train go in 30 minutes?
Rohit goes 350 km in 5 hours. Find:
(i) his speed
(ii) the distance covered by Rohit in 6.2 hours
(iii) the time taken by him to cover 210 km.
I travel a distance of 10 km and come back in `2 1/2` hours. What is my speed?
A man walks a distance of 5 km in 2 hours. Then he goes in a bus to a nearby town, which is 40 km, in further 2 hours. From there, he goes to his office in an autorickshaw, a distance of 5 km, in `1/2` hour. What was his average speed during the whole journey?
Mr. Amit can walk 8 km in 1 hour 20 minutes. How long will it take him to walk:
(i) 2500 m?
(ii) 6.5 km?
Anbarasan travelled 350 Km at the speed of 70 Km/hour. Find the time taken for his travel
Name two things that are lying to your west.
Look at the different types of boats.
Some boats have motors and go further into the sea. since they go far out they can catch more fish. These boats travel faster, at a speed of about 20 km in one hour.
How far would the motorboats go in three and a half hours?
Look at the different types of boats.
Some boats have motors and go further into the sea. since they go far out they can catch more fish. These boats travel faster, at a speed of about 20 km in one hour.
How much time will they take to go 85 km?
The SI unit of speed is:
