Vincent drove from Town L to Town M which was 370 km away. He started from Town L at an average speed of 73 km/h. He maintained this speed for 4 h before increasing it by 10 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
= 4 x 73
= 292 km
New speed for rest of the journey
= 73 + 10
= 83 km / h
Remaining distance for rest of the journey
= 370 - 292
= 78 km
Time taken for rest of the journey
= 78 ÷ 83
= 1 h
Total time taken
= 4 + 1
= 5 h
(b)
Average speed of the whole journey
= 370 ÷ 5
= 74 km
Answer(s): (a) 5 h; (b) 74km/h