Sam drove from Town U to Town V which was 630 km away. He started from Town U at an average speed of 62 km/h. He maintained this speed for 4 h before increasing it by 5 km/h for the rest of the journey to Town V.
- How long did he take to complete the whole journey?
- What was his average speed from Town U to Town V?
(a)
Distance of 1st part of the journey
= 4 x 62
= 248 km
New speed for rest of the journey
= 62 + 5
= 67 km / h
Remaining distance for rest of the journey
= 630 - 248
= 382 km
Time taken for rest of the journey
= 382 ÷ 67
= 3 h
Total time taken
= 4 + 3
= 7 h
(b)
Average speed of the whole journey
= 630 ÷ 7
= 90 km
Answer(s): (a) 7 h; (b) 90km/h