Question : Working 15 hours a day, Vaibhav can complete a piece of work in 35 days. How many hours a day should he work to finish the work in 25 days?
Option 1: 21 hours
Option 2: 20 hours
Option 3: 18 hours
Option 4: 17 hours
Correct Answer: 21 hours
Solution :
Total time taken = 15 × 35 = 525 hours
Hence, the correct answer is 21 hours.