Anukriti February 08 2022 10:05:42 PMHence, you can do it with the help of shortcut.
When distances are same and we need to calculate Average Speed, it is given by harmonic Mean of the given speeds.
HM = 2ab/a+b
a = 64 km/hr
b = 80 km/hr
Putting values, Average Spped = 71.11 km/hr