At the moment a pendulum crosses a marker, a timer reads 1 minute 30 seconds. It then crosses the same marker 12 further times while travelling in the same direction. When it crosses for the last time, the timer reads 2 minutes 18 seconds. What is the time period of oscillation of the pendulum?
- A4.0 s
- B4.4 s
- C7.5 s
- D12 s