Two equal sums of money are lent at the same time at 8% and 7% per annum simple interest. The former is recovered 6 months earlier than the latter and the amount in each case is Rs 2560. The sum and the time for which the sums of money are lent out are Rs 2000, 3.5 years `xx` 4 years (b) Rs 1500, 3.5 years `xx` 4 years (c) Rs 2000, 4 years `xx` 5.5 years (d) Rs 3000, 4 years `xx` 4.5 years