Henry drove from Town H to Town J which was 704 km away. He started from Town H at an average speed of 73 km/h. He maintained this speed for 3 h before increasing it by 10 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
= 3 x 73
= 219 km
New speed for rest of the journey
= 73 + 10
= 83 km / h
Remaining distance for rest of the journey
= 704 - 219
= 485 km
Time taken for rest of the journey
= 485 ÷ 83
= 5 h
Total time taken
= 3 + 5
= 8 h
(b)
Average speed of the whole journey
= 704 ÷ 8
= 88 km
Answer(s): (a) 8 h; (b) 88km/h