May cycled for 3 days. She cycled 6 km on the first day for 2/3 hr and 1/3 of the remaining journey on the second day. Then she had 1/2 of the total journey left. If her average speed for the entire journey was 12 km/h, find
a) total distance
b) May’s average speed for the last 2 days.
pls help. thank you.