At 9.45 a.m., Albert started driving from Town V to Town W which was 380 km away. For the first 230 km, he travelled at an average speed of 92 km/h. He then decreased his speed by 20 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 W?
(a)
Time taken for the first 230 km
= 230 ÷ 92
= 2
4692 = 2
12 h
Speed for the remaining journey
= 92 - 20
= 72 km/h
Remaining distance
= 380 - 230
= 150 km
Time taken for the remaining journey
= 150 ÷ 72
= 2
672= 2
112 h
Total time taken
= 2
12 + 2
112= 2
612 + 2
112= 4
712 h
(b)
1 h = 60 min
712 h =
712 x 60 = 35 min
4 h 35 min after 9.45 a.m. = 2.20 p.m.
Answer(s): (a) 44
712 h; (b) 2.20 p.m.