Ken drove from Town J to Town K which was 504 km away. He started from Town J at an average speed of 67 km/h. He maintained this speed for 4 h before increasing it by 6 km/h for the rest of the journey to Town K.
- How long did he take to complete the whole journey?
- What was his average speed from Town J to Town K?
(a)
Distance of 1st part of the journey
= 4 x 67
= 268 km
New speed for rest of the journey
= 67 + 6
= 73 km / h
Remaining distance for rest of the journey
= 504 - 268
= 236 km
Time taken for rest of the journey
= 236 ÷ 73
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 504 ÷ 6
= 84 km
Answer(s): (a) 6 h; (b) 84km/h