Question

needed now IUINARU UU
A takes 40 minutes to do a job. B takes 1 hour to do the same job. A, B and C start doing that JUULUU
complete it in only 15 minutes. Had C been alone, how much time would he have taken to do that job?
A car uses 50 litres to cover 950 km. What is the output of the car per litre ?​

Answer 1

Answer:

Let 1/A = 1/40

and 1/B = 1/60

and 1/A + 1/B + 1/C = 1/15

Add equation 1 and 2

1/A + 1/B = 5 / 120 = 1 /24

Subtract it from equation 3

1/C = 1/24 - 1 /15 = 1 / 40

C = 40 minutes

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Explanation: