Fred drove from Town X to Town Y which was 426 km away. He started from Town X at an average speed of 63 km/h. He maintained this speed for 3 h before increasing it by 9 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
= 3 x 63
= 189 km
New speed for rest of the journey
= 63 + 9
= 72 km / h
Remaining distance for rest of the journey
= 426 - 189
= 237 km
Time taken for rest of the journey
= 237 ÷ 72
= 3 h
Total time taken
= 3 + 3
= 6 h
(b)
Average speed of the whole journey
= 426 ÷ 6
= 71 km
Answer(s): (a) 6 h; (b) 71km/h