Fred drove from Town E to Town F which was 539 km away. He started from Town E at an average speed of 62 km/h. He maintained this speed for 4 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
= 4 x 62
= 248 km
New speed for rest of the journey
= 62 + 7
= 69 km / h
Remaining distance for rest of the journey
= 539 - 248
= 291 km
Time taken for rest of the journey
= 291 ÷ 69
= 3 h
Total time taken
= 4 + 3
= 7 h
(b)
Average speed of the whole journey
= 539 ÷ 7
= 77 km
Answer(s): (a) 7 h; (b) 77km/h