Cole drove from Town X to Town Y which was 360 km away. He started from Town X at an average speed of 63 km/h. He maintained this speed for 2 h before increasing it by 5 km/h for the rest of the journey to Town Y.
- How long did he take to complete the whole journey?
- What was his average speed from Town X to Town Y?
(a)
Distance of 1st part of the journey
= 2 x 63
= 126 km
New speed for rest of the journey
= 63 + 5
= 68 km / h
Remaining distance for rest of the journey
= 360 - 126
= 234 km
Time taken for rest of the journey
= 234 ÷ 68
= 2 h
Total time taken
= 2 + 2
= 4 h
(b)
Average speed of the whole journey
= 360 ÷ 4
= 90 km
Answer(s): (a) 4 h; (b) 90km/h