Ben drove from Town W to Town X which was 696 km away. He started from Town W at an average speed of 67 km/h. He maintained this speed for 4 h before increasing it by 10 km/h for the rest of the journey to Town X.
- How long did he take to complete the whole journey?
- What was his average speed from Town W to Town X?
(a)
Distance of 1st part of the journey
= 4 x 67
= 268 km
New speed for rest of the journey
= 67 + 10
= 77 km / h
Remaining distance for rest of the journey
= 696 - 268
= 428 km
Time taken for rest of the journey
= 428 ÷ 77
= 4 h
Total time taken
= 4 + 4
= 8 h
(b)
Average speed of the whole journey
= 696 ÷ 8
= 87 km
Answer(s): (a) 8 h; (b) 87km/h