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It is not so much as assumption in this case. Here, the total units of work is 70 units and since A (when working alone) does the work in 14 hours, A's efficieny is 70/14 = 5 units Similarly, Since both do the work in 10 hours, their combined efficiency is 7 units.

This makes the efficiency of B(2 units), and the time it takes him to complete the work 35 hours(Option C)

==> For work rate questions, you solve “together and alone” reciprocally. It takes A 14hrs alone, and if you set the hours it took B to work alone as B hrs, from \((\frac{1}{14})+(\frac{1}{B})=\frac{1}{10}\) and \(\frac{1}{B}=(\frac{1}{10})-(\frac{1}{14})=\frac{1}{35}\), you get \(B=35\).

Version 8.1 of the WordPress for Android app is now available, with some great enhancements to publishing: background media uploading. Adding images to a post or page? Now...

“Keep your head down, and work hard. Don’t attract any attention. You should be grateful to be here.” Why do we keep quiet? Being an immigrant is a constant...

“Keep your head down, and work hard. Don’t attract any attention. You should be grateful to be here.” Why do we keep quiet? Being an immigrant is a constant...