Question

If x can finish a job in 4 hours and y can finish the same job in 8 hours, then
they both together will finish the job in
(A) 160 minutes
(B) 150 minutes
(C) 140 minutes
(D) 120 minutes
(E) None of these​

Answer 1

Answer:

Given :-

Number of hours taken by X to finish a job = 4 hours

Number of hours taken by Y to finish a job = 8 hours

Conversion (From hours to minutes as the answer is expected in minutes) :

∴ 1 hour = 60 minutes.

∴ 4 hours = 60 × 4

= 240 minutes

∴ 8 hours = 60 × 8

= 480 minutes

To find :-

The time they both can finish the job in = ?

Solution :-

Time taken by X to finish a job = 4 hours

Time taken by Y to finish a job = 8 hours

∴ ( x + y )'s one day's work = 1/4 + 1/8

= 3/8

∴ Required time = 8/3 hours

= (8/3 × 60) minutes

= 160 minutes

∴ X and Y together will do the job in 160 minutes.

Correct option :- (A) 160 minutes.

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Answer 2

Answer:

160 minutes

Step-by-step explanation:

8/3 ×60 =160