Question

hstse
CLASS
08 )
A man rode a bike up the hill at a speed of 10 km an
hour and down the same distance at a speed of 20
kmph. Select option that shows correctly the average
speed of round trip.
(A) 12 1/2 kmph
(B) 13 1/3 kmph
(C) 14 1/3 kmph
(D) 15 kmph​

Answer 1

Answer:

option number B=13 1/3kmph

Answer 2

D)15 kmph

Step-by-step explanation:

Speed of man when the man rode a bike up the hill=$v_1$=10 kmph

Speed of man when the man rode a bike down the hill,$v_2$=20 kmph

We know that

Average speed=$\frac{sum\;of\;speed}{total\;number\;of \;speed}$

Average speed=$\frac{v_1+v_2}{2}$

By using the formula of average speed

Then,we get

Average speed of round trip=$\frac{10+20}{2} kmph$

Average speed of round trip=15 kmph

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