Brandon drove from Town X to Town Y which was 440 km away. He started from Town X at an average speed of 65 km/h. He maintained this speed for 4 h before increasing it by 9 km/h for the rest of the journey to Town Y.
- How long did he take to complete the whole journey?
- What was his average speed from Town X to Town Y?
(a)
Distance of 1st part of the journey
= 4 x 65
= 260 km
New speed for rest of the journey
= 65 + 9
= 74 km / h
Remaining distance for rest of the journey
= 440 - 260
= 180 km
Time taken for rest of the journey
= 180 ÷ 74
= 1 h
Total time taken
= 4 + 1
= 5 h
(b)
Average speed of the whole journey
= 440 ÷ 5
= 88 km
Answer(s): (a) 5 h; (b) 88km/h