Brandon drove from Town L to Town M which was 522 km away. He started from Town L at an average speed of 73 km/h. He maintained this speed for 3 h before increasing it by 5 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 73
= 219 km
New speed for rest of the journey
= 73 + 5
= 78 km / h
Remaining distance for rest of the journey
= 522 - 219
= 303 km
Time taken for rest of the journey
= 303 ÷ 78
= 3 h
Total time taken
= 3 + 3
= 6 h
(b)
Average speed of the whole journey
= 522 ÷ 6
= 87 km
Answer(s): (a) 6 h; (b) 87km/h