Rohan alone can do a work in 10 days and Mohan alone can do the same work in 15 days. In how many days will they together complete the same work?
Answer & explanation
Correct answer: option 1
Total work = LCM of 10, 15 = 30
Together they take $\frac{total\; work}{efficiency}$
= $\frac{30}{5}$ = 6 days