Asher drove from Town C to Town D which was 616 km away. He started from Town C at an average speed of 63 km/h. He maintained this speed for 2 h before increasing it by 6 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
= 2 x 63
= 126 km
New speed for rest of the journey
= 63 + 6
= 69 km / h
Remaining distance for rest of the journey
= 616 - 126
= 490 km
Time taken for rest of the journey
= 490 ÷ 69
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 616 ÷ 7
= 88 km
Answer(s): (a) 7 h; (b) 88km/h