Answer:
49 minutes
Explanation:
call 1 hour 19 mins 79 mins, and call 3 hours 180 mins.
Let Franklin be called F, Nancy N and Pete P.
F = N - 79 (since F spent 1 hour 19 less than N)
N = P - 52 (since N spent 52 less than P)
P = 180 (mins).
N = P - 52
= 180 - 52
= 128.
F = N - 79
= 128 - 79
= 49.
so Franklin spent 49 minutes reading