Archie drove from Town Z to Town A which was 534 km away. He started from Town Z at an average speed of 80 km/h. He maintained this speed for 3 h before increasing it by 8 km/h for the rest of the journey to Town A.
- How long did he take to complete the whole journey?
- What was his average speed from Town Z to Town A?
(a)
Distance of 1st part of the journey
= 3 x 80
= 240 km
New speed for rest of the journey
= 80 + 8
= 88 km / h
Remaining distance for rest of the journey
= 534 - 240
= 294 km
Time taken for rest of the journey
= 294 ÷ 88
= 3 h
Total time taken
= 3 + 3
= 6 h
(b)
Average speed of the whole journey
= 534 ÷ 6
= 89 km
Answer(s): (a) 6 h; (b) 89km/h