Zeph drove from Town E to Town F which was 525 km away. He started from Town E at an average speed of 64 km/h. He maintained this speed for 2 h before increasing it by 10 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
= 2 x 64
= 128 km
New speed for rest of the journey
= 64 + 10
= 74 km / h
Remaining distance for rest of the journey
= 525 - 128
= 397 km
Time taken for rest of the journey
= 397 ÷ 74
= 5 h
Total time taken
= 2 + 5
= 7 h
(b)
Average speed of the whole journey
= 525 ÷ 7
= 75 km
Answer(s): (a) 7 h; (b) 75km/h