Table 1 shows the mean rate of transpiration for four different tomato cultivars under controlled conditions.
| Tomato cultivar | Mean rate of transpiration (g m−2 h−1\text{g}\ \text{m}^{-2}\ \text{h}^{-1}g m−2 h−1) |
|---|---|
| P | 5.82 |
| Q | 2.14 |
| R | 1.68 |
| S | 3.45 |
Calculate how many times greater the mean rate of transpiration of cultivar P is than the mean rate of transpiration of cultivar R.
Give your answer to 2 significant figures.