If the body covers one-third distance at speed v1, next one third at speed v2 and last one third at speed v3, then average speed will be a) frac{{{upsilon }_{1}},{{upsilon }_{2}}+{{upsilon }_{2}},{{upsilon }_{3}}+{{upsilon }_{3}},{{upsilon }_{1}}}{{{upsilon }_{1}}+{{upsilon }_{2}}+{{upsilon }_{3}}} b) frac{{{upsilon }_{1}}+{{upsilon }_{2}}+{{upsilon }_{3}}}{3} c) frac{{{upsilon }_{1}},{{upsilon }_{2}},{{upsilon }_{3}}}{{{upsilon }_{1}},{{upsilon }_{2}}+{{upsilon }_{2}},{{upsilon }_{3}}+{{upsilon }_{3}},{{upsilon }_{1}}} d) frac{3{{upsilon }_{1}},{{upsilon }_{2}},{{upsilon }_{3}}}{{{upsilon }_{1}},{{upsilon }_{2}}+{{upsilon }_{2}},{{upsilon }_{3}}+{{upsilon }_{3}},{{upsilon }_{1}}}
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