Valen drove from Town V to Town W which was 525 km away. He started from Town V at an average speed of 61 km/h. He maintained this speed for 4 h before increasing it by 6 km/h for the rest of the journey to Town W.
- How long did he take to complete the whole journey?
- What was his average speed from Town V to Town W?
(a)
Distance of 1st part of the journey
= 4 x 61
= 244 km
New speed for rest of the journey
= 61 + 6
= 67 km / h
Remaining distance for rest of the journey
= 525 - 244
= 281 km
Time taken for rest of the journey
= 281 ÷ 67
= 3 h
Total time taken
= 4 + 3
= 7 h
(b)
Average speed of the whole journey
= 525 ÷ 7
= 75 km
Answer(s): (a) 7 h; (b) 75km/h