Zeph drove from Town C to Town D which was 444 km away. He started from Town C at an average speed of 65 km/h. He maintained this speed for 4 h before increasing it by 10 km/h for the rest of the journey to Town D.
- How long did he take to complete the whole journey?
- What was his average speed from Town C to Town D?
(a)
Distance of 1st part of the journey
= 4 x 65
= 260 km
New speed for rest of the journey
= 65 + 10
= 75 km / h
Remaining distance for rest of the journey
= 444 - 260
= 184 km
Time taken for rest of the journey
= 184 ÷ 75
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 444 ÷ 6
= 74 km
Answer(s): (a) 6 h; (b) 74km/h