Chemical Kinetics Part 2

Consider the two different first order reactions given below
A+B⟶C (Reaction 1)
P⟶Q (Reaction 2)
The ratio of the half life of Reaction 1 : Reaction 2 is 5:2. If t1 and t2 represent the time taken to complete 2∕3‌rd ‌ and 4∕5 of Reaction 1 and Reaction 2, respectively, then the value of the ratio t1:t2 is ‌‌‌‌ ×10−1 (nearest integer).
[Given: log10(3)=0.477 and log10(5)=0.699 ]