Working 15 hours a day, Vaibhav can complete a piece of work in 35 days. How many hours a day should he work so as finish the work in 25 days?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 21 hours.
Given that
Vaibhav works 15 hours a day for 35 days to complete the work
Let him work for x hours to complete the work in 25 days
Hence, 15 × 35 = 25 × x
⇒ x = 21
Hence, he needs to work for 21 hours in a day to complete the work in 25 days.