alleryRohan and Rohit together can finish a job in 10 days, while Rohan alone can do it in 15 days. In how many days can Rohit alone finish the job?
A25 days
B32 days
C30 days
D35 days
Answer & Solution
Correct answer: C. 30 days
1. Together one day's work = 1/10; Rohan's one day's work = 1/15.
2. Rohit's one day's work = 1/10 - 1/15 = 3/30 - 2/30 = 1/30.
3. So Rohit alone takes 30 days.
_Source: RRB Group D CEN-02/2018 PYQ, Q.46._
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