Daniel drove from Town V to Town W which was 616 km away. He started from Town V at an average speed of 71 km/h. He maintained this speed for 2 h before increasing it by 5 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
= 2 x 71
= 142 km
New speed for rest of the journey
= 71 + 5
= 76 km / h
Remaining distance for rest of the journey
= 616 - 142
= 474 km
Time taken for rest of the journey
= 474 ÷ 76
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 616 ÷ 7
= 88 km
Answer(s): (a) 7 h; (b) 88km/h