Ethan drove from Town U to Town V which was 456 km away. He started from Town U at an average speed of 62 km/h. He maintained this speed for 3 h before increasing it by 7 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
= 3 x 62
= 186 km
New speed for rest of the journey
= 62 + 7
= 69 km / h
Remaining distance for rest of the journey
= 456 - 186
= 270 km
Time taken for rest of the journey
= 270 ÷ 69
= 3 h
Total time taken
= 3 + 3
= 6 h
(b)
Average speed of the whole journey
= 456 ÷ 6
= 76 km
Answer(s): (a) 6 h; (b) 76km/h