Albert drove from Town G to Town H which was 288 km away. He started from Town G at an average speed of 66 km/h. He maintained this speed for 2 h before increasing it by 6 km/h for the rest of the journey to Town H.
- How long did he take to complete the whole journey?
- What was his average speed from Town G to Town H?
(a)
Distance of 1st part of the journey
= 2 x 66
= 132 km
New speed for rest of the journey
= 66 + 6
= 72 km / h
Remaining distance for rest of the journey
= 288 - 132
= 156 km
Time taken for rest of the journey
= 156 ÷ 72
= 2 h
Total time taken
= 2 + 2
= 4 h
(b)
Average speed of the whole journey
= 288 ÷ 4
= 72 km
Answer(s): (a) 4 h; (b) 72km/h