exam Maths Puzzle Numerical Ability

Multiply. (5a - 3b)^2

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m to the eighth power n to the sixth power over m to the fourth power n to the second power. mohan can mow a piece of land in 4hrs. Kumar can mow it in 3hrs. Mohan can started mowing lawn all by himself and an hour later kumar joined with him together they finished mowing the lawn in total? Howlong did it take to move the lawn?