Wesley drove from Town D to Town E which was 504 km away. He started from Town D at an average speed of 65 km/h. He maintained this speed for 4 h before increasing it by 9 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
= 4 x 65
= 260 km
New speed for rest of the journey
= 65 + 9
= 74 km / h
Remaining distance for rest of the journey
= 504 - 260
= 244 km
Time taken for rest of the journey
= 244 ÷ 74
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 504 ÷ 6
= 84 km
Answer(s): (a) 6 h; (b) 84km/h