Valen drove from Town S to Town T which was 348 km away. He started from Town S at an average speed of 69 km/h. He maintained this speed for 3 h before increasing it by 7 km/h for the rest of the journey to Town T.
- How long did he take to complete the whole journey?
- What was his average speed from Town S to Town T?
(a)
Distance of 1st part of the journey
= 3 x 69
= 207 km
New speed for rest of the journey
= 69 + 7
= 76 km / h
Remaining distance for rest of the journey
= 348 - 207
= 141 km
Time taken for rest of the journey
= 141 ÷ 76
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 348 ÷ 4
= 87 km
Answer(s): (a) 4 h; (b) 87km/h