Liam drove from Town F to Town G which was 405 km away. He started from Town F at an average speed of 62 km/h. He maintained this speed for 2 h before increasing it by 9 km/h for the rest of the journey to Town G.
- How long did he take to complete the whole journey?
- What was his average speed from Town F to Town G?
(a)
Distance of 1st part of the journey
= 2 x 62
= 124 km
New speed for rest of the journey
= 62 + 9
= 71 km / h
Remaining distance for rest of the journey
= 405 - 124
= 281 km
Time taken for rest of the journey
= 281 ÷ 71
= 3 h
Total time taken
= 2 + 3
= 5 h
(b)
Average speed of the whole journey
= 405 ÷ 5
= 81 km
Answer(s): (a) 5 h; (b) 81km/h