Discussion of Question with ID = 023 under Time-and-Work

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Question

A can harvest a field in 7 days. B can do the same work in 10 days. In how many days will they together harvest the field?

A

$4{2/17}$ days.

B

$5{2/17}$ days.

C

$6{2/17}$ days.

D

$7{2/17}$ days.

Soln.
Ans: a

Putting x = 7 and y = 10 in the shortcut method, we get ${xy}/{x + y}$ = ${70/17}$, which is same as: $4{2/17}$.


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