Tim drove from Town A to Town B which was 525 km away. He started from Town A at an average speed of 69 km/h. He maintained this speed for 3 h before increasing it by 8 km/h for the rest of the journey to Town B.
- How long did he take to complete the whole journey?
- What was his average speed from Town A to Town B?
(a)
Distance of 1st part of the journey
= 3 x 69
= 207 km
New speed for rest of the journey
= 69 + 8
= 77 km / h
Remaining distance for rest of the journey
= 525 - 207
= 318 km
Time taken for rest of the journey
= 318 ÷ 77
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 525 ÷ 7
= 75 km
Answer(s): (a) 7 h; (b) 75km/h