Answer: 57.1 km/ h
Step-by-step explanation:
First find the amount of time it took for Olly to drive from Liverpool to Manchester.
Time = Distance / Speed
= 56 / 70
= 0.8 hours
It took 75 minutes to drive from Manchester to Sheffield. In hours that it:
= 75 / 60 minutes
= 1.25 hours
Total time taken to travel from Liverpool to Sheffield is therefore:
= 0.8 + 1.25
= 2.05 hours
Distance travelled from Liverpool to Sheffield:
= Distance from Liverpool to Manchester + Distance from Manchester to Sheffield
= 56 + 61
= 117 km
Average speed for the whole journey is therefore:
= Distance / Time
= 117 / 2.05
= 57.1 km/ h
