Higher November 2020 Paper 2 Q9
9. The speed limit on a road is decreased from 70 mph to 50 mph.
The road is 7·3 miles long.
How much longer does it take to travel along the road at 50 mph than at 70 mph?
Give your answer in minutes correct to 1 decimal place. [4]
| Scheme | Marks | Comments |
|---|---|---|
| \((7{\cdot}3\times60\div50)-(7{\cdot}3\times60\div70)\) | M3 | May be seen in stages Allow M3 for \((7{\cdot}3\times60\div70)-(7{\cdot}3\times60\div50)\) M2 for \(7{\cdot}3\div50-7{\cdot}3\div70\) (=0·146 - 0·104..= 0·0417… or 0·042) may be embedded in other calculations OR \(7{\cdot}3\times60\div50\) (=8.76 min) OR \(7{\cdot}3\times60\div70\) (= 6.257… min) M1 for \(7{\cdot}3\div70\) (=0·104..) OR \(7{\cdot}3\div50\) (=0·146) |
| 2·5 (mins) | A1 | CAO |
| (4) |