Simon drove from Town K to Town L which was 445 km away. He started from Town K at an average speed of 76 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 76
= 304 km
New speed for rest of the journey
= 76 + 8
= 84 km / h
Remaining distance for rest of the journey
= 445 - 304
= 141 km
Time taken for rest of the journey
= 141 ÷ 84
= 1 h
Total time taken
= 4 + 1
= 5 h
(b)
Average speed of the whole journey
= 445 ÷ 5
= 89 km
Answer(s): (a) 5 h; (b) 89km/h