Question

TULI UPUUM
Question
Two gardeners work for a hotel. First gardener can mow the lawn in 40 min and second gardener can mow the lawn in 60 min. How long will it take, if both work
simultaneously?
24 min
20 min
ОООО
30 min
34 min​

Answer 1

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Time taken by A to mow = 40 mins

So, in 1 min A will mow = 1/40 lawn

Time taken by B to mow = 60 mins

So, in 1 min B will mow = 1/60 lawn

Now, in 1 min both A and B will mow = 1/40 + 1/60

3/120 + 2/120 = 5/120 = 1/24

So, in 1 min both A and B will mow 1/24 lawn.

Therefore, both A and B will mow the lawn in 24 mins.

So, correct answer is 24 minutes.

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