Fred drove from Town X to Town Y which was 432 km away. He started from Town X at an average speed of 66 km/h. He maintained this speed for 2 h before increasing it by 5 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
= 2 x 66
= 132 km
New speed for rest of the journey
= 66 + 5
= 71 km / h
Remaining distance for rest of the journey
= 432 - 132
= 300 km
Time taken for rest of the journey
= 300 ÷ 71
= 4 h
Total time taken
= 2 + 4
= 6 h
(b)
Average speed of the whole journey
= 432 ÷ 6
= 72 km
Answer(s): (a) 6 h; (b) 72km/h