Pierre drove from Town W to Town X which was 296 km away. He started from Town W at an average speed of 71 km/h. He maintained this speed for 3 h before increasing it by 4 km/h for the rest of the journey to Town X.
- How long did he take to complete the whole journey?
- What was his average speed from Town W to Town X?
(a)
Distance of 1st part of the journey
= 3 x 71
= 213 km
New speed for rest of the journey
= 71 + 4
= 75 km / h
Remaining distance for rest of the journey
= 296 - 213
= 83 km
Time taken for rest of the journey
= 83 ÷ 75
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 296 ÷ 4
= 74 km
Answer(s): (a) 4 h; (b) 74km/h