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Time and Work | Time and Work Exercise 11.1

Question 7

A and B can do a piece of work in 18 days; B and C in 24 days and A and C in 36days. In what time can they do it, all working together?

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The given details are,

A and B can do a piece of work in = 18 days

Work done by A and B in 1 day = 1/18

B and C can do a piece of work in = 24 days

Work done by B and C in 1 day = 1/24

A and C can do a piece of work in = 36 days

Work done by A and C in 1 day = 1/36

By adding A, B and C we get,

2(A+B+C) one day work = 1/18 + 1/24 + 1/36

= (4+3+2)/72 (by taking LCM for 18, 24 and 36 which is 72)

= 9/72

= 1/8

A+B+C one day work = 1/(8×2) = 1/16

∴ A, B and C together can finish the work in = 1/(1/16) = 16days.

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Question 7

A and B can do a piece of work in 18 days; B and C in 24 days and A and C in 36days. In what time can they do it, all working together?

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

The given details are,

A and B can do a piece of work in = 18 days

Work done by A and B in 1 day = 1/18

B and C can do a piece of work in = 24 days

Work done by B and C in 1 day = 1/24

A and C can do a piece of work in = 36 days

Work done by A and C in 1 day = 1/36

By adding A, B and C we get,

2(A+B+C) one day work = 1/18 + 1/24 + 1/36

= (4+3+2)/72 (by taking LCM for 18, 24 and 36 which is 72)

= 9/72

= 1/8

A+B+C one day work = 1/(8×2) = 1/16

∴ A, B and C together can finish the work in = 1/(1/16) = 16days.

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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