Simon drove from Town D to Town E which was 516 km away. He started from Town D at an average speed of 71 km/h. He maintained this speed for 4 h before increasing it by 5 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 71
= 284 km
New speed for rest of the journey
= 71 + 5
= 76 km / h
Remaining distance for rest of the journey
= 516 - 284
= 232 km
Time taken for rest of the journey
= 232 ÷ 76
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 516 ÷ 6
= 86 km
Answer(s): (a) 6 h; (b) 86km/h