Cody drove from Town S to Town T which was 486 km away. He started from Town S at an average speed of 67 km/h. He maintained this speed for 2 h before increasing it by 5 km/h for the rest of the journey to Town T.
- How long did he take to complete the whole journey?
- What was his average speed from Town S to Town T?
(a)
Distance of 1st part of the journey
= 2 x 67
= 134 km
New speed for rest of the journey
= 67 + 5
= 72 km / h
Remaining distance for rest of the journey
= 486 - 134
= 352 km
Time taken for rest of the journey
= 352 ÷ 72
= 4 h
Total time taken
= 2 + 4
= 6 h
(b)
Average speed of the whole journey
= 486 ÷ 6
= 81 km
Answer(s): (a) 6 h; (b) 81km/h