At 11.40 a.m., Elijah started driving from Town W to Town X which was 340 km away. For the first 210 km, he travelled at an average speed of 105 km/h. He then decreased his speed by 27 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 X?
(a)
Time taken for the first 210 km
= 210 ÷ 105
= 2/1
= 2 h
Speed for the remaining journey
= 105 - 27
= 78 km/h
Remaining distance
= 340 - 210
= 130 km
Time taken for the remaining journey
= 130 ÷ 78
= 1
5278= 1
23 h
Total time taken
= 2 + 1
23= 2/1 + 1
23= 3
23 h
(b)
1 h = 60 min
23 h =
23 x 60 = 40 min
3 h 40 min after 11.40 a.m. = 3.20 p.m.
Answer(s): (a) 33
23 h; (b) 3.20 p.m.