Tommy drove from Town M to Town N which was 696 km away. He started from Town M at an average speed of 63 km/h. He maintained this speed for 3 h before increasing it by 8 km/h for the rest of the journey to Town N.
- How long did he take to complete the whole journey?
- What was his average speed from Town M to Town N?
(a)
Distance of 1st part of the journey
= 3 x 63
= 189 km
New speed for rest of the journey
= 63 + 8
= 71 km / h
Remaining distance for rest of the journey
= 696 - 189
= 507 km
Time taken for rest of the journey
= 507 ÷ 71
= 5 h
Total time taken
= 3 + 5
= 8 h
(b)
Average speed of the whole journey
= 696 ÷ 8
= 87 km
Answer(s): (a) 8 h; (b) 87km/h