Sam drove from Town X to Town Y which was 528 km away. He started from Town X at an average speed of 61 km/h. He maintained this speed for 4 h before increasing it by 8 km/h for the rest of the journey to Town Y.
- How long did he take to complete the whole journey?
- What was his average speed from Town X to Town Y?
(a)
Distance of 1st part of the journey
= 4 x 61
= 244 km
New speed for rest of the journey
= 61 + 8
= 69 km / h
Remaining distance for rest of the journey
= 528 - 244
= 284 km
Time taken for rest of the journey
= 284 ÷ 69
= 2 h
Total time taken
= 4 + 2
= 6 h
(b)
Average speed of the whole journey
= 528 ÷ 6
= 88 km
Answer(s): (a) 6 h; (b) 88km/h