Mary left home at 7.35 a.m. and drove towards the city which was 720 km away. For the first 348 km, she was travelling at 87 km/h. Then she increased her speed by 6 km/h and completed the remaining journey.
- How long did she take for her whole journey?
- At what time did she reach the city?
(a)
Time taken to travel 348 km
= 348 ÷ 87
= 4 h
Distance of the remaining journey
= 720 - 348
= 372 km
Speed for remaining journey
= 87 + 6
= 93 km/h
Time taken to travel remaining journey
= 372 ÷ 93
= 4 h
Time taken to travel the whole journey
= 4 + 4
= 8 h
(b)
8 h after 7.35 a.m. = 3.35 p.m.
Answer(s): (a) 8 h; (b) 3.35 p.m.