SSC Steno Grade C and D 15 Nov 2021 Shift 2 Paper

Anvita's mobile company charges $\mathit{₹}2$ for the first 5 minutes of a call, and 35 paise per minute after the first 5 minutes. If Anvita was charged ₹9 in total for a call with her friend, what was the duration (in minutes) of the call?