Owen drove from Town Q to Town R which was 588 km away. He started from Town Q at an average speed of 75 km/h. He maintained this speed for 2 h before increasing it by 9 km/h for the rest of the journey to Town R.
- How long did he take to complete the whole journey?
- What was his average speed from Town Q to Town R?
(a)
Distance of 1st part of the journey
= 2 x 75
= 150 km
New speed for rest of the journey
= 75 + 9
= 84 km / h
Remaining distance for rest of the journey
= 588 - 150
= 438 km
Time taken for rest of the journey
= 438 ÷ 84
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 588 ÷ 7
= 84 km
Answer(s): (a) 7 h; (b) 84km/h