I think it is 70 but it is given 68.6
in question number 14
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Answer:
no it is 68.6
Explanation:
speed ,S1=60kmph
S2=80 kmph
T1=dist/S1=5/6
T2=dist/S2=5/8
Total time =T1+T2
=5/6+5/8
=70/48
Total dist=100km
AVG. speed =100/70/48
=100*48/78
=68.6Kmph
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