Andy drove from Town K to Town L which was 532 km away. He started from Town K at an average speed of 62 km/h. He maintained this speed for 3 h before increasing it by 4 km/h for the rest of the journey to Town L.
- How long did he take to complete the whole journey?
- What was his average speed from Town K to Town L?
(a)
Distance of 1st part of the journey
= 3 x 62
= 186 km
New speed for rest of the journey
= 62 + 4
= 66 km / h
Remaining distance for rest of the journey
= 532 - 186
= 346 km
Time taken for rest of the journey
= 346 ÷ 66
= 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