Liam drove from Town K to Town L which was 595 km away. He started from Town K at an average speed of 75 km/h. He maintained this speed for 3 h before increasing it by 5 km/h for the rest of the journey to Town L.
- How long did he take to complete the whole journey?
- What was his average speed from Town K to Town L?
(a)
Distance of 1st part of the journey
= 3 x 75
= 225 km
New speed for rest of the journey
= 75 + 5
= 80 km / h
Remaining distance for rest of the journey
= 595 - 225
= 370 km
Time taken for rest of the journey
= 370 ÷ 80
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 595 ÷ 7
= 85 km
Answer(s): (a) 7 h; (b) 85km/h