At 10.35 a.m., Bobby started driving from Town B to Town C which was 300 km away. For the first 190 km, he travelled at an average speed of 75 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 C?
(a)
Time taken for the first 190 km
= 190 ÷ 75
= 2
4075 = 2
815 h
Speed for the remaining journey
= 75 - 25
= 50 km/h
Remaining distance
= 300 - 190
= 110 km
Time taken for the remaining journey
= 110 ÷ 50
= 2
1050= 2
15 h
Total time taken
= 2
815 + 2
15= 2
815 + 2
315= 4
1115 h
(b)
1 h = 60 min
1115 h =
1115 x 60 = 44 min
4 h 44 min after 10.35 a.m. = 3.19 p.m.
Answer(s): (a) 44
1115 h; (b) 3.19 p.m.