Caden drove from Town P to Town Q which was 588 km away. He started from Town P at an average speed of 69 km/h. He maintained this speed for 3 h before increasing it by 9 km/h for the rest of the journey to Town Q.
- How long did he take to complete the whole journey?
- What was his average speed from Town P to Town Q?
(a)
Distance of 1st part of the journey
= 3 x 69
= 207 km
New speed for rest of the journey
= 69 + 9
= 78 km / h
Remaining distance for rest of the journey
= 588 - 207
= 381 km
Time taken for rest of the journey
= 381 ÷ 78
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 588 ÷ 7
= 84 km
Answer(s): (a) 7 h; (b) 84km/h