Henry drove from Town F to Town G which was 288 km away. He started from Town F at an average speed of 60 km/h. He maintained this speed for 3 h before increasing it by 7 km/h for the rest of the journey to Town G.
- How long did he take to complete the whole journey?
- What was his average speed from Town F to Town G?
(a)
Distance of 1st part of the journey
= 3 x 60
= 180 km
New speed for rest of the journey
= 60 + 7
= 67 km / h
Remaining distance for rest of the journey
= 288 - 180
= 108 km
Time taken for rest of the journey
= 108 ÷ 67
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 288 ÷ 4
= 72 km
Answer(s): (a) 4 h; (b) 72km/h