7 A field is in the shape of a quadrilateral PQRS. A path crosses the field from P to R. PQ = 280 m, RS = 146 m and PR = 325 m. S is on a bearing of 042° from P, PSRˆ = 108° and RPQˆ = 38°. (a) Calculate the bearing of R from P. (b) (i) Show that QR = 202 m, correct to the nearest metre. (ii) Mia walks at a constant speed of 5.5 km/h. Calculate the time it takes her to walk from Q to R. Give your answer in minutes and seconds, correct to the nearest second.