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A man at a speed of 6 km/hr for 1 km and...

A man at a speed of 6 km/hr for 1 km and 8 km/hr for the next 1 km. What is his average speed for the walk of 2 km?

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Verified by Experts

Distance traveled is 2km.
Time taken=`(1km)/(6km//hr)+(1km)/(8km//hr)`
=`((1)/(6)+(1)/(8))hr=(7)/(24)` hr.
Average speed =`(2kmxx24)/(7hr)=(48)/(7) km/hr=7km//hr`
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