Julian drove from Town S to Town T which was 332 km away. He started from Town S at an average speed of 74 km/h. He maintained this speed for 3 h before increasing it by 5 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 74
= 222 km
New speed for rest of the journey
= 74 + 5
= 79 km / h
Remaining distance for rest of the journey
= 332 - 222
= 110 km
Time taken for rest of the journey
= 110 ÷ 79
= 1 h
Total time taken
= 3 + 1
= 4 h
(b)
Average speed of the whole journey
= 332 ÷ 4
= 83 km
Answer(s): (a) 4 h; (b) 83km/h