A boy goes to school with speed of 60 km/ hr and returns back with the speed of 80 km/hr . Find the average speed of the boy?
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Answer:
Correct option is
C
x+y
2xy
km/hr
Let the distance between home and school =S km
Time taken to reach school from home =
x
S
hr.
Time consumed to reach home from school =
y
S
hr
Average speed =
Total time taken
Total distance
=
x
S
+
y
S
S+S
=
x
1
+
y
1
2
=
x+y
2xy
km/hr
Step-by-step explanation:
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