Oliver drove from Town S to Town T which was 456 km away. He started from Town S at an average speed of 63 km/h. He maintained this speed for 2 h before increasing it by 6 km/h for the rest of the journey to Town T.
- How long did he take to complete the whole journey?
- What was his average speed from Town S to Town T?
(a)
Distance of 1st part of the journey
= 2 x 63
= 126 km
New speed for rest of the journey
= 63 + 6
= 69 km / h
Remaining distance for rest of the journey
= 456 - 126
= 330 km
Time taken for rest of the journey
= 330 ÷ 69
= 4 h
Total time taken
= 2 + 4
= 6 h
(b)
Average speed of the whole journey
= 456 ÷ 6
= 76 km
Answer(s): (a) 6 h; (b) 76km/h