Ravi can decorate a wall in 6 hours, while Ankita can decorate the same wall in 10 hours. In how many hours will they decorate the wall working simultaneously?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 3.75 hours.
Ravi can decorate a wall = 6 hours
Ankita can decorate the same wall = 10 hours
Total work = LCM of 6 and 10 = 30 unit
Efficiency = Total work/Total time
So, the efficiency of Ravi and Ankita = 5 unit per hour and 3 unit per hour
They decorate the wall while working simultaneously.
So, time = 30/8 = 3.75 hours