Dylan drove from Town W to Town X which was 534 km away. He started from Town W at an average speed of 70 km/h. He maintained this speed for 4 h before increasing it by 8 km/h for the rest of the journey to Town X.
- How long did he take to complete the whole journey?
- What was his average speed from Town W to Town X?
(a)
Distance of 1st part of the journey
= 4 x 70
= 280 km
New speed for rest of the journey
= 70 + 8
= 78 km / h
Remaining distance for rest of the journey
= 534 - 280
= 254 km
Time taken for rest of the journey
= 254 ÷ 78
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 534 ÷ 6
= 89 km
Answer(s): (a) 6 h; (b) 89km/h