Michael drove from Town Q to Town R which was 360 km away. He started from Town Q at an average speed of 69 km/h. He maintained this speed for 2 h before increasing it by 7 km/h for the rest of the journey to Town R.
- How long did he take to complete the whole journey?
- What was his average speed from Town Q to Town R?
(a)
Distance of 1st part of the journey
= 2 x 69
= 138 km
New speed for rest of the journey
= 69 + 7
= 76 km / h
Remaining distance for rest of the journey
= 360 - 138
= 222 km
Time taken for rest of the journey
= 222 ÷ 76
= 3 h
Total time taken
= 2 + 3
= 5 h
(b)
Average speed of the whole journey
= 360 ÷ 5
= 72 km
Answer(s): (a) 5 h; (b) 72km/h