A father is 5 times faster than the son. The father completes a work 40 days before the son. If both of them work together, when will the work be completed?

A

8 days

B

8 (1/3) days

C

10 days

D

20 days

Correct Option -** B**

Explaination

Time taken is inversely proportional to efficiency.

Since the father is 5 times faster than the son, the time taken by the father and son to complete the work will be in the ratio 1:5.

Let the no. of days be x and 5x.

The father takes 40 days less.

5x-x=40

x=10

If both of them work together,

(10*50)/(10+50)

= 500/60

= 8 1/3 day

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