A first order reaction is 60% complete in 20 min. How long will the reaction take to be 84% complete?

A first order reaction is 60% complete in 20 minutes . How long will the reaction take to be 84% complete ?

A first order reaction is 60% complete in 20 minutes .How long will the reaction take to be 84% complete ?

A first order reaction is 15% complete in 20 minutes. How long will it take to be 60% complete.

A first order reaction is 15% complete in 20 minutes. How long will it take to complete 60%?

A first order reaction is 15% complete in 20 minutes. How long will it take to complete 20%.

A first order reaction is 20% complete in 10 min. How long it takes to complete 80% ?