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Q.

A vehicle travels 4 km with speed of 3km/h and another 4 km with speed of 5 km/h, then its average speed is 

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a

3.75 km/h

b

3.50km/h

c

4.00 km/h

d

4.25 km/h

answer is B.

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Detailed Solution

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vavg=s1+s2s1/v1+s2/v2=4+44/3+4/5=5.3.25+3

          ==3.75km/h

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