Question

Hemant can finish a certain work in 15 days. Dev is 50% more efficient than Hemant. If they work together, in how many days can they finish the work?​

Answer 1

Answer:

11.25 days. Cause Dev can finish the work in 7.5 days alone but as of Hemant is working with him therefore the time required would be the avg of the days both take i.e. (15+7.5)/2 which is 11.25