Will drove from Town N to Town P which was 567 km away. He started from Town N at an average speed of 79 km/h. He maintained this speed for 3 h before increasing it by 5 km/h for the rest of the journey to Town P.
- How long did he take to complete the whole journey?
- What was his average speed from Town N to Town P?
(a)
Distance of 1st part of the journey
= 3 x 79
= 237 km
New speed for rest of the journey
= 79 + 5
= 84 km / h
Remaining distance for rest of the journey
= 567 - 237
= 330 km
Time taken for rest of the journey
= 330 ÷ 84
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 567 ÷ 7
= 81 km
Answer(s): (a) 7 h; (b) 81km/h