Jeremy drove from Town J to Town K which was 375 km away. He started from Town J at an average speed of 73 km/h. He maintained this speed for 3 h before increasing it by 7 km/h for the rest of the journey to Town K.
- How long did he take to complete the whole journey?
- What was his average speed from Town J to Town K?
(a)
Distance of 1st part of the journey
= 3 x 73
= 219 km
New speed for rest of the journey
= 73 + 7
= 80 km / h
Remaining distance for rest of the journey
= 375 - 219
= 156 km
Time taken for rest of the journey
= 156 ÷ 80
= 2 h
Total time taken
= 3 + 2
= 5 h
(b)
Average speed of the whole journey
= 375 ÷ 5
= 75 km
Answer(s): (a) 5 h; (b) 75km/h