A car travel up the hill at a constant speed of 30/kmph and returns down the hill at a constant speed of 60/kmph calculate the average speed of whole trip
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90/kmph , mark me as brainlist
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The average speed is the ratio of total traveled distance to total time taken.
Let d be the total distance traveled by the car.
Thus distance traveled in each journey is d/2.
So, the time taken for going up the hill is t
1
=
v
1
(d/2)
=
37
d/2
=
74
d
Time taken for going down the hill is t
2
=
66
(d/2)
=
132
d
Thus, average speed is v
avg
=
t
1
+t
2
L
=
(L/74+L/132)
L
=47.4km
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