(a) If the average speed of the bus increases by 5 km/h, find the distance to be travelled by the bus in 1.5 hours.
(b) If the average speed of the bus reduces by 10m/s, find the distance to be travelled by the bus in 45 minutes.
how to do? and 點解？
更新1:
ｓｔｅｐ ｂｙ ｓｔｅｐ， ｐｌｚ
