Asher drove from Town S to Town T which was 630 km away. He started from Town S at an average speed of 73 km/h. He maintained this speed for 2 h before increasing it by 10 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 73
= 146 km
New speed for rest of the journey
= 73 + 10
= 83 km / h
Remaining distance for rest of the journey
= 630 - 146
= 484 km
Time taken for rest of the journey
= 484 ÷ 83
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 630 ÷ 7
= 90 km
Answer(s): (a) 7 h; (b) 90km/h