Xavier drove from Town T to Town U which was 370 km away. He started from Town T 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 U.
- How long did he take to complete the whole journey?
- What was his average speed from Town T to Town U?
(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
= 370 - 134
= 236 km
Time taken for rest of the journey
= 236 ÷ 72
= 3 h
Total time taken
= 2 + 3
= 5 h
(b)
Average speed of the whole journey
= 370 ÷ 5
= 74 km
Answer(s): (a) 5 h; (b) 74km/h