- A36
- B25
- C65
- D32.5
Step-by-Step Solution
Tenzing's rate = 1/20 - 1/45 = 9/180 - 4/180 = 5/180 = 1/36 per hour, so he alone takes 36 hours.
Answer: A) 36
Working as a pair, Tenzing and Pema stitch a batch of school bags in 20 hours. Pema alone would need 45 hours. How long would Tenzing take on his own, in hours?
Competition practiceTime & Work / Pipes
Master this topic in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Time & Work / Pipes practice questions
More Time & Work / Pipes practice
An overhead tank fills through its inlet in 12 hours, and its outlet can empty it when…Two motors pump water into a temple tank in Madurai: one alone needs 15 minutes, the…Imtiaz can whitewash a large school building in 63 days and Farooq can do it in 126…Together, Ritu and Shalini can weave a durrie in 24 days. Ritu working alone needs 33…A is twice as efficient as B. Working together they complete a piece of work in 12 days.…