These there questions I don't quite understand how to find the initial amount invested for the first two, and I don't understand the last one as much. Thank you

Harder 9) Money is invested into an account that 10) Money was invested into an account that pays 3.8%, simple interest. After 2 years pays 2.14%, simple interest. After 40 the account's total value is $8608. How months the account's total value is much was invested? $13391.67. How much was invested? 11) Jimmy and Jenny both invest in 2 simple interest bank accounts. Jimmy invests $3000 in account A and $6000 into account B. Jenny invests $5000 into account A and Jenny invests $3000 into account B. After 1 year, Jimmy earns $270 interest and Jenny earns $275. Determine the simple interest rates for the 2 accounts