At 8.35 a.m., Daniel started driving from Town K to Town L which was 410 km away. For the first 160 km, he travelled at an average speed of 100 km/h. He then decreased his speed by 25 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 L?
(a)
Time taken for the first 160 km
= 160 ÷ 100
= 1
60100 = 1
35 h
Speed for the remaining journey
= 100 - 25
= 75 km/h
Remaining distance
= 410 - 160
= 250 km
Time taken for the remaining journey
= 250 ÷ 75
= 3
2575= 3
13 h
Total time taken
= 1
35 + 3
13= 1
915 + 3
515= 4
1415 h
(b)
1 h = 60 min
1415 h =
1415 x 60 = 56 min
4 h 56 min after 8.35 a.m. = 1.31 p.m.
Answer(s): (a) 44
1415 h; (b) 1.31 p.m.