Archie drove from Town U to Town V which was 516 km away. He started from Town U at an average speed of 65 km/h. He maintained this speed for 2 h before increasing it by 5 km/h for the rest of the journey to Town V.
- How long did he take to complete the whole journey?
- What was his average speed from Town U to Town V?
(a)
Distance of 1st part of the journey
= 2 x 65
= 130 km
New speed for rest of the journey
= 65 + 5
= 70 km / h
Remaining distance for rest of the journey
= 516 - 130
= 386 km
Time taken for rest of the journey
= 386 ÷ 70
= 4 h
Total time taken
= 2 + 4
= 6 h
(b)
Average speed of the whole journey
= 516 ÷ 6
= 86 km
Answer(s): (a) 6 h; (b) 86km/h