Cycling trip

This task is about calculating time and speed.
young people biking
 
A group of scouts went on a cycling tour. This table shows how far they travelled each day.
 
Day
Trip
Distance
1
Scout Hut to Fisherman's Cove
28 kilometres
2
Fisherman's Cove to Lookout Ridge
40 kilometres
3
Lookout Ridge to Scout Hut
50 kilometres
 
a)
   
On day one they rode for 4 hours.
 
 
 
What was their average speed? __________ km/h
 
b)
On day two their average speed was 8 kilometres per hour (km/h).
 
 
 
How much time were they cycling for? __________ hours
 
c)
On day three they rode back to Scout Hut. The trip took 4 hours.
 
 
 
What was their average speed? __________ km/h