Peter drove from Town L to Town M which was 360 km away. He started from Town L at an average speed of 60 km/h. He maintained this speed for 3 h before increasing it by 6 km/h for the rest of the journey to Town M.
- How long did he take to complete the whole journey?
- What was his average speed from Town L to Town M?
(a)
Distance of 1st part of the journey
= 3 x 60
= 180 km
New speed for rest of the journey
= 60 + 6
= 66 km / h
Remaining distance for rest of the journey
= 360 - 180
= 180 km
Time taken for rest of the journey
= 180 ÷ 66
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 360 ÷ 4
= 90 km
Answer(s): (a) 4 h; (b) 90km/h