Warren drove from Town E to Town F which was 420 km away. He started from Town E at an average speed of 65 km/h. He maintained this speed for 3 h before increasing it by 7 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 65
= 195 km
New speed for rest of the journey
= 65 + 7
= 72 km / h
Remaining distance for rest of the journey
= 420 - 195
= 225 km
Time taken for rest of the journey
= 225 ÷ 72
= 3 h
Total time taken
= 3 + 3
= 6 h
(b)
Average speed of the whole journey
= 420 ÷ 6
= 70 km
Answer(s): (a) 6 h; (b) 70km/h