Ian drove from Town N to Town P which was 532 km away. He started from Town N at an average speed of 65 km/h. He maintained this speed for 3 h before increasing it by 4 km/h for the rest of the journey to Town P.
- How long did he take to complete the whole journey?
- What was his average speed from Town N to Town P?
(a)
Distance of 1st part of the journey
= 3 x 65
= 195 km
New speed for rest of the journey
= 65 + 4
= 69 km / h
Remaining distance for rest of the journey
= 532 - 195
= 337 km
Time taken for rest of the journey
= 337 ÷ 69
= 4 h
Total time taken
= 3 + 4
= 7 h
(b)
Average speed of the whole journey
= 532 ÷ 7
= 76 km
Answer(s): (a) 7 h; (b) 76km/h