Question

Jeweler A can set an average round-cut diamond in 20 minutes. Jeweler B required 15 minutest set the same type of diamond. In 8 hours, how many more diamonds can Jeweler B set than Jeweler A ?

Answer 1

So in 8 hours he will set 8 more diamonds.

Explanation:

Jeweler A can set in 60 minute (1 hour) 60/20=3 diamonds.

Jeweler B can set 60/15=4 diamonds.

Jeweler B sets 1 more diamond than A in one hour.

So in 8 hours he will set 8 more diamonds.