Dhawan and Satish started a start-up by investing 35000 and 21000 respectively. The ratio of months invested by Dhawan and Satish is p ∶ q and the number of months for which Satish invested into the business was 4 less than the number of the month for which Dhawan invested. If the ratio of the total profit to the share of Dhawan was 7 ∶ 5, then find the value of p and q respectively.