City J and City K were 612 km apart. A sedan travelled from City J towards City K. At the same time, a van started from City K to City J. After travelling 114
h, the two vehicles were still 432 km apart. If the ratio of the average speed of the van to that of the sedan was 4 : 5, find
- the average speed of the van.
- the time taken for them to meet travelling the rest of the journey. Express your answer in h.