Oliver drove from Town K to Town L which was 525 km away. He started from Town K at an average speed of 65 km/h. He maintained this speed for 2 h before increasing it by 10 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
= 2 x 65
= 130 km
New speed for rest of the journey
= 65 + 10
= 75 km / h
Remaining distance for rest of the journey
= 525 - 130
= 395 km
Time taken for rest of the journey
= 395 ÷ 75
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 525 ÷ 7
= 75 km
Answer(s): (a) 7 h; (b) 75km/h