Caden drove from Town M to Town N which was 640 km away. He started from Town M at an average speed of 62 km/h. He maintained this speed for 4 h before increasing it by 8 km/h for the rest of the journey to Town N.
- How long did he take to complete the whole journey?
- What was his average speed from Town M to Town N?
(a)
Distance of 1st part of the journey
= 4 x 62
= 248 km
New speed for rest of the journey
= 62 + 8
= 70 km / h
Remaining distance for rest of the journey
= 640 - 248
= 392 km
Time taken for rest of the journey
= 392 ÷ 70
= 4 h
Total time taken
= 4 + 4
= 8 h
(b)
Average speed of the whole journey
= 640 ÷ 8
= 80 km
Answer(s): (a) 8 h; (b) 80km/h