Explanation:

- Radha can complete the work in 3 days, so she does 1/3 of the work in a day.

- Raji can complete the work in 2 days, so she does 1/2 of the work in a day.

- Together in one day, they complete: 1/3 + 1/2 = 2/6 + 3/6 = 5/6 of the work.

- Therefore, they complete the work together in 6/5 days.

- Radha's contribution to the work is (1/3) / (5/6) = 2/5.

- Raji's contribution is (1/2) / (5/6) = 3/5.

- Total payment is Rs150.

- Radha's share is 2/5 of Rs150 = Rs60.

- Raji's share is 3/5 of Rs150 = Rs90.

- Correct Answer: Rs60

.