Archie drove from Town Z to Town A which was 534 km away. He started from Town Z at an average speed of 76 km/h. He maintained this speed for 2 h before increasing it by 7 km/h for the rest of the journey to Town A.
- How long did he take to complete the whole journey?
- What was his average speed from Town Z to Town A?
(a)
Distance of 1st part of the journey
= 2 x 76
= 152 km
New speed for rest of the journey
= 76 + 7
= 83 km / h
Remaining distance for rest of the journey
= 534 - 152
= 382 km
Time taken for rest of the journey
= 382 ÷ 83
= 4 h
Total time taken
= 2 + 4
= 6 h
(b)
Average speed of the whole journey
= 534 ÷ 6
= 89 km
Answer(s): (a) 6 h; (b) 89km/h