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Hope this helps youSTEP 1: Convert hours to minutes:
1 1/2 hour = 1 h 30 mins = 90 mins
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STEP 2: Find their work rate:
Gardener A = 90 mins
⇒ 1 min = 1/90 of the work done
Gardener B = 54 mins
⇒ 1 min = 1/54 of the work done
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STEP 3 : Find amount of work done in 1 min:
1 min = 1/90 + 1/54 = 4/135 of the work done.
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STEP 4: Find amount of work done in 18 mins:
1 min = 4/135
18 mins = 4/135 x 18 = 8/15 of the work done
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STEP 5: Find amount of work left:
Work left = 1 - 8/15 = 7/15 of work left
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STEP 6: Find amount of time Gardener A needs to finish up the rest of the work:
* Time needed = amount of work divided by the amount of work he can complete in 1 min.
Time needed = 7/15 ÷ 1/90 = 42 mins
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Answer: Gardener A needs another 42 minutes to finish up the work.