Luke drove from Town W to Town X which was 352 km away. He started from Town W at an average speed of 73 km/h. He maintained this speed for 2 h before increasing it by 6 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
= 2 x 73
= 146 km
New speed for rest of the journey
= 73 + 6
= 79 km / h
Remaining distance for rest of the journey
= 352 - 146
= 206 km
Time taken for rest of the journey
= 206 ÷ 79
= 2 h
Total time taken
= 2 + 2
= 4 h
(b)
Average speed of the whole journey
= 352 ÷ 4
= 88 km
Answer(s): (a) 4 h; (b) 88km/h