At 11.15 a.m., Gabriel started driving from Town U to Town V which was 480 km away. For the first 220 km, he travelled at an average speed of 80 km/h. He then decreased his speed by 30 km/h and completed the remaining journey.
- Find the total time taken for the whole journey. Express your answer as a mixed number.
- At what time did she reach Town V?
(a)
Time taken for the first 220 km
= 220 ÷ 80
= 2
6080 = 2
34 h
Speed for the remaining journey
= 80 - 30
= 50 km/h
Remaining distance
= 480 - 220
= 260 km
Time taken for the remaining journey
= 260 ÷ 50
= 5
1050= 5
15 h
Total time taken
= 2
34 + 5
15= 2
1520 + 5
420= 7
1920 h
(b)
1 h = 60 min
1920 h =
1920 x 60 = 57 min
7 h 57 min after 11.15 a.m. = 7.12 p.m.
Answer(s): (a) 77
1920 h; (b) 7.12 p.m.