book Maths Puzzle Numerical Ability

Joe digs a ditch in 3.2 hours.
Joe working with George can did the same length ditch in 2.7 hours.
How long would it take George to dig the ditch by himself.

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book Other Question

Can someone please answer this problem for me?
What units in the metric system would you use to measure each of the following quantities?
(a) Distance from Los Angeles to Ne
x/3+3x/4=13/3