Will drove from Town K to Town L which was 704 km away. He started from Town K at an average speed of 69 km/h. He maintained this speed for 4 h before increasing it by 8 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
= 4 x 69
= 276 km
New speed for rest of the journey
= 69 + 8
= 77 km / h
Remaining distance for rest of the journey
= 704 - 276
= 428 km
Time taken for rest of the journey
= 428 ÷ 77
= 4 h
Total time taken
= 4 + 4
= 8 h
(b)
Average speed of the whole journey
= 704 ÷ 8
= 88 km
Answer(s): (a) 8 h; (b) 88km/h