10. Solving a chemistry problem

10. The decomposition reaction of substance A can proceed in parallel in three directions:
A→k1 B
A→k2 C
A→k3 D
The concentrations of the products in the mixture 5 min after the start of the reaction were equal: [B]=3.2 mol*l-1, [C]=1.8 mol*l-1, [D]=4.0 mol*l- 1. Determine the rate constants k1-k3 if the half-life of substance A is 10 minutes.