Usha left home at 7.40 a.m. and drove towards the city which was 1123 km away. For the first 486 km, she was travelling at 81 km/h. Then she increased her speed by 10 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 486 km
= 486 ÷ 81
= 6 h
Distance of the remaining journey
= 1123 - 486
= 637 km
Speed for remaining journey
= 81 + 10
= 91 km/h
Time taken to travel remaining journey
= 637 ÷ 91
= 7 h
Time taken to travel the whole journey
= 7 + 6
= 13 h
(b)
13 h after 7.40 a.m. = 8.40 p.m.
Answer(s): (a) 13 h; (b) 8.40 p.m.