VTMO 2017 — Grade 4 — semifinal Question 11

Two clocks stop during an outage. On restoration, clock $1$ resets to $00 : 00$ and clock $2$ resumes from its stopped reading. Power is out from $2 : 00$ to $3 : 15$; Thanh wakes at $7 : 00$. How many minutes apart are the readings?