Ratio
WA3 Revision 1 (2023 SCT Q1)
30:15:8
A pipe delivers 9 litres of water in 20 seconds.
Find the amount of water, in litres, it delivers per minute.
27 litres per minute
Express 65km/h in m/s.
(65 x 1000) m / (1 x 3600) m
= 18.1 m/s
Express 30g: 1.2kg as a ratio in its simplest form.
1:40
Henry's resting heart rate is 26 beats per 20 seconds.
Ann's resting heart rate is 22 beats per 15 seconds.
Whose heart beats at a faster rate?
Henry's heart rate per minute = 26 x 3 = 78bpm
Ann's heart rate per minute= 22 x 4 = 88 bpm
Ann's heart beats at a faster rate.
Express 1.5m/s in km/h
(1.5/1000) km/ (1/3600) h = 5.4 km/h
WA3 Revision 2 - 2025 Q3
21:4
WA3 Revision 1 (2023 SCT) Q5b
1678 Euros
WA3 Revision 1 (2023 SCT) Q6
Jon's average speed for the whole journey is 7 58/89km/h or 7.69 km/h (3sf)
Jogging Distance = 8 x 1.25 = 10 km
walking time = 900m / 1.5 = 600s = 10 mins
Average speed
= total distance / total time
= (10 + 0.9) / (1.25 + 10/60) h
=7 58/89km/h or 7.69 km/h (3sf)
WA3 Revision 1 (2023 SCT) Q3a
40 degrees
Cindy and Eddie work in a hotel. Cindy can clean 17 rooms in 5 hours and Eddie can clean 14 rooms in 4 hours. How long will it ake for them to finish cleaning 100 rooms together. Give your answers in hours and minutes, correct to the nearest minute.
14 hours 30 mins
WA3 revision 2 - 2025 WA Q8a, b, c
8a) Jogging distance = 96 x 2.5 = 240 km
8b) time taken for walk
= 145 / 100
= 1.45h
= 1h 27 min
8c) average speed
= total distance/ total time
= (240+145)km / (2.5 + 30/60 + 1.45) h
= 86 49/89 km/h or 86.5 km/h (3sf)