Carl drove from Town T to Town U which was 588 km away. He started from Town T at an average speed of 67 km/h. He maintained this speed for 3 h before increasing it by 4 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
= 3 x 67
= 201 km
New speed for rest of the journey
= 67 + 4
= 71 km / h
Remaining distance for rest of the journey
= 588 - 201
= 387 km
Time taken for rest of the journey
= 387 ÷ 71
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 588 ÷ 7
= 84 km
Answer(s): (a) 7 h; (b) 84km/h