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?
Solution
Correct Answer: Option B
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/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/hr
Practice More Questions on Our App!
Download our app for free and access thousands of MCQ questions with detailed solutions