Dylan drove from Town H to Town J which was 581 km away. He started from Town H at an average speed of 65 km/h. He maintained this speed for 4 h before increasing it by 6 km/h for the rest of the journey to Town J.
- How long did he take to complete the whole journey?
- What was his average speed from Town H to Town J?
(a)
Distance of 1st part of the journey
= 4 x 65
= 260 km
New speed for rest of the journey
= 65 + 6
= 71 km / h
Remaining distance for rest of the journey
= 581 - 260
= 321 km
Time taken for rest of the journey
= 321 ÷ 71
= 3 h
Total time taken
= 4 + 3
= 7 h
(b)
Average speed of the whole journey
= 581 ÷ 7
= 83 km
Answer(s): (a) 7 h; (b) 83km/h