Vincent drove from Town B to Town C which was 528 km away. He started from Town B at an average speed of 61 km/h. He maintained this speed for 2 h before increasing it by 4 km/h for the rest of the journey to Town C.
- How long did he take to complete the whole journey?
- What was his average speed from Town B to Town C?
(a)
Distance of 1st part of the journey
= 2 x 61
= 122 km
New speed for rest of the journey
= 61 + 4
= 65 km / h
Remaining distance for rest of the journey
= 528 - 122
= 406 km
Time taken for rest of the journey
= 406 ÷ 65
= 4 h
Total time taken
= 2 + 4
= 6 h
(b)
Average speed of the whole journey
= 528 ÷ 6
= 88 km
Answer(s): (a) 6 h; (b) 88km/h