Peter drove from Town F to Town G which was 616 km away. He started from Town F at an average speed of 76 km/h. He maintained this speed for 2 h before increasing it by 6 km/h for the rest of the journey to Town G.
- How long did he take to complete the whole journey?
- What was his average speed from Town F to Town G?
(a)
Distance of 1st part of the journey
= 2 x 76
= 152 km
New speed for rest of the journey
= 76 + 6
= 82 km / h
Remaining distance for rest of the journey
= 616 - 152
= 464 km
Time taken for rest of the journey
= 464 ÷ 82
= 6 h
Total time taken
= 2 + 6
= 8 h
(b)
Average speed of the whole journey
= 616 ÷ 8
= 77 km
Answer(s): (a) 8 h; (b) 77km/h