It took 3 people 5 hours to build a garden wall. another garden wall is to be built. the new wall is the same length but twice the height as the first wall. how long will it take 5 people to build the new wall?

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Answer 1 · 2018-04-17T21:22:50

It took #3xx5=15# man-hours to build the first wall.

The new wall is twice as high, so it will take #2xx15=30# man-hours. If this is done by 5 men, this will take #30div5=6# hours.

Note:
"Man" and "men" to be read as "people", but the term "person-hours" sounds a bit funny.