Decomposition of 3 A(g) -> 2 B (g) + 2C (g) follows first order kinetics. Initially only A is present in the container

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Q 2613191040.     Decomposition of 3 A(g) -> 2 B (g) + 2C (g) follows first order kinetics. Initially only A is present in the container. Pressure developed after 20 min. and infinite time are 3.5 and 4 atm respectively. Which of the following is true.

(This question may have multiple correct answers)

A t_(50%) = 20 min
B t_(75%) = 40 min
C t_(99%) = 64//3 min
D t_(87.5%) = 60 min

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