A train runs at 80 kmph for the first 40 km and the next 30 km at 60 kmph. Find the average speed.
Time taken to cover 40 km = $$\frac{40}{80}=\frac{1}{2\ }\ hour$$
Time taken to cover 30 km = $$\frac{30}{60}=\frac{1}{2}\ hour$$
Average speed = $$\frac{Total\ dis\tan ce}{Total\ time}=\frac{70}{1}=70$$ kmph .
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