Ahmad drove from Town T to Town U which was 328 km away. He started from Town T at an average speed of 64 km/h. He maintained this speed for 3 h before increasing it by 7 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 64
= 192 km
New speed for rest of the journey
= 64 + 7
= 71 km / h
Remaining distance for rest of the journey
= 328 - 192
= 136 km
Time taken for rest of the journey
= 136 ÷ 71
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 328 ÷ 4
= 82 km
Answer(s): (a) 4 h; (b) 82km/h