Answer:
Displacement travelled in time \[({{t}_{1}}+{{t}_{2}})={{\upsilon
}_{1}}{{t}_{1}}+{{\upsilon }_{2}}{{t}_{2}}\]
\[\therefore \] \[\text{Average
velocity }=\frac{displacement}{total\,time\,taken}=\frac{{{\upsilon
}_{1}}{{t}_{1}}+{{\upsilon }_{2}}{{t}_{2}}}{\left( {{t}_{1}}+{{t}_{2}}
\right)}\]
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