Question

Revisit
A person travels 120 km at the speed of 60 km/hr, 30 km at the speed of 30 km/hr and 90 km at the speed of 90
km/hr. Find the average speed of the person.​

Answer 1

Answer:

Step-by-step explanation:

Letthedistancebex,

timetakentotravel=  

120

x

​  

,

timetakentoreturn=  

80

x

​  

,

averagespeed=  

timetaken

Totaldistance

​  

 

=  

120

x

​  

+  

80

x

​  

 

2x

​  

=  

5x

2x∗240

​  

=96km/hr

Answer 2

$total \: distance = 120 + 30 + 90 \\ = 240 \: km$

$total \: time \: taken = 4 \: hours$

$average \: speed = \frac{240}{4} = 60$

60 km/h