Tommy drove from Town H to Town J which was 574 km away. He started from Town H at an average speed of 61 km/h. He maintained this speed for 3 h before increasing it by 6 km/h for the rest of the journey to Town J.
- How long did he take to complete the whole journey?
- What was his average speed from Town H to Town J?
(a)
Distance of 1st part of the journey
= 3 x 61
= 183 km
New speed for rest of the journey
= 61 + 6
= 67 km / h
Remaining distance for rest of the journey
= 574 - 183
= 391 km
Time taken for rest of the journey
= 391 ÷ 67
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 574 ÷ 7
= 82 km
Answer(s): (a) 7 h; (b) 82km/h