Peter drove from Town C to Town D which was 304 km away. He started from Town C at an average speed of 63 km/h. He maintained this speed for 2 h before increasing it by 7 km/h for the rest of the journey to Town D.
- How long did he take to complete the whole journey?
- What was his average speed from Town C to Town D?
(a)
Distance of 1st part of the journey
= 2 x 63
= 126 km
New speed for rest of the journey
= 63 + 7
= 70 km / h
Remaining distance for rest of the journey
= 304 - 126
= 178 km
Time taken for rest of the journey
= 178 ÷ 70
= 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