Question
If Rina can complete a project in 36 days by working 9
hours a day, how many hours per day should she work to complete the project in 18 days?Solution
ATQ,
Let the efficiency of Rina be 'x' units per hour
Therefore, total work = 9 × 36 × x = 324x units
Let the time she should work to complete the work in 18 days be 'y' hours a day.
ATQ;
324x = 18 × y × x
Or, y = 18
Therefore, she should work for 18 hours a day.
Alternate solution:
Required time = (9 × 36) ÷ 18 = 18 hours
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