Tim drove from Town T to Town U which was 532 km away. He started from Town T at an average speed of 68 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 68
= 136 km
New speed for rest of the journey
= 68 + 5
= 73 km / h
Remaining distance for rest of the journey
= 532 - 136
= 396 km
Time taken for rest of the journey
= 396 ÷ 73
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 532 ÷ 7
= 76 km
Answer(s): (a) 7 h; (b) 76km/h