Eric drove from Town K to Town L which was 296 km away. He started from Town K at an average speed of 61 km/h. He maintained this speed for 3 h before increasing it by 8 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 61
= 183 km
New speed for rest of the journey
= 61 + 8
= 69 km / h
Remaining distance for rest of the journey
= 296 - 183
= 113 km
Time taken for rest of the journey
= 113 ÷ 69
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 296 ÷ 4
= 74 km
Answer(s): (a) 4 h; (b) 74km/h