Peter drove from Town X to Town Y which was 304 km away. He started from Town X at an average speed of 64 km/h. He maintained this speed for 2 h before increasing it by 9 km/h for the rest of the journey to Town Y.
- How long did he take to complete the whole journey?
- What was his average speed from Town X to Town Y?
(a)
Distance of 1st part of the journey
= 2 x 64
= 128 km
New speed for rest of the journey
= 64 + 9
= 73 km / h
Remaining distance for rest of the journey
= 304 - 128
= 176 km
Time taken for rest of the journey
= 176 ÷ 73
= 2 h
Total time taken
= 2 + 2
= 4 h
(b)
Average speed of the whole journey
= 304 ÷ 4
= 76 km
Answer(s): (a) 4 h; (b) 76km/h