Will drove from Town D to Town E which was 435 km away. He started from Town D at an average speed of 65 km/h. He maintained this speed for 3 h before increasing it by 8 km/h for the rest of the journey to Town E.
- How long did he take to complete the whole journey?
- What was his average speed from Town D to Town E?
(a)
Distance of 1st part of the journey
= 3 x 65
= 195 km
New speed for rest of the journey
= 65 + 8
= 73 km / h
Remaining distance for rest of the journey
= 435 - 195
= 240 km
Time taken for rest of the journey
= 240 ÷ 73
= 2 h
Total time taken
= 3 + 2
= 5 h
(b)
Average speed of the whole journey
= 435 ÷ 5
= 87 km
Answer(s): (a) 5 h; (b) 87km/h