Subject
Quantitative Aptitude
Topic
Speed & Distance
A boy rides his bicycle 10 km at an average speed of 12km/hr and again travels 12 km at an average speed of 10 km/hr. His average speed for the entire trip is approximately?
A boy rides his bicycle 10 km at an average speed of 12km/hr and again travels 12 km at an average speed of 10 km/hr. His average speed for the entire trip is approximately?
ক)
10.4 km/hrখ)
10.8 km/hrগ)
11 km/hrঘ)
12.2 km/hrExplanation
মোট অতিবাহিত সময় = {(10/12)+(12/10)} hr = {(50+72)/60} hr = (122/60) hr = (61/30) hr মোট অতিক্রান্ত দূরত্ব = ( 10+12 ) = 22 কিলোমিটার ∴ গড় গতি = (দূরত্ব/সময়) = {22/(61/30)} = {22×(30/61)} = 10.8 km/hrRelated questions
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