Xavier drove from Town Z to Town A which was 602 km away. He started from Town Z at an average speed of 78 km/h. He maintained this speed for 2 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
= 2 x 78
= 156 km
New speed for rest of the journey
= 78 + 8
= 86 km / h
Remaining distance for rest of the journey
= 602 - 156
= 446 km
Time taken for rest of the journey
= 446 ÷ 86
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 602 ÷ 7
= 86 km
Answer(s): (a) 7 h; (b) 86km/h