Jack travelled from home to office at an average rate of 40 km/hour .Then he drove back home from office at an average rate of 60 km /hour .If he spent a total of 2 hours in travelling and he took the same road each way,what is the total distance (in km) that Jack travelled?
Solution
Correct Answer: Option C
মনে করি,
বাড়ি থেকে অফিসের দূরত্ব =x km
অতএব , গড় বেগ =মোট দূরত্ব /মোট সময়
=(x+x)/ x/40 +x/60
=2x/ {(3x+2x)/12}
=2x/(5x/120)
=2x ×(120/5x)
=48 km/h
অতএব ,মোট দূরত্ব =2×48 =96 km
বাড়ি থেকে অফিসের দূরত্ব =x km
অতএব , গড় বেগ =মোট দূরত্ব /মোট সময়
=(x+x)/ x/40 +x/60
=2x/ {(3x+2x)/12}
=2x/(5x/120)
=2x ×(120/5x)
=48 km/h
অতএব ,মোট দূরত্ব =2×48 =96 km
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