Paul drove from Town E to Town F which was 405 km away. He started from Town E at an average speed of 60 km/h. He maintained this speed for 3 h before increasing it by 5 km/h for the rest of the journey to Town F.
- How long did he take to complete the whole journey?
- What was his average speed from Town E to Town F?
(a)
Distance of 1st part of the journey
= 3 x 60
= 180 km
New speed for rest of the journey
= 60 + 5
= 65 km / h
Remaining distance for rest of the journey
= 405 - 180
= 225 km
Time taken for rest of the journey
= 225 ÷ 65
= 2 h
Total time taken
= 3 + 2
= 5 h
(b)
Average speed of the whole journey
= 405 ÷ 5
= 81 km
Answer(s): (a) 5 h; (b) 81km/h