allery30 km/h গতিত গ'লে এজন ছাত্ৰ বিদ্যালয় 5 minutes পলমকৈ পায় আৰু 40 km/h গতিত গ'লে 5 minutes সোনকালে পায়। বিদ্যালয়খন কিমান দূৰত?
A20 km
B25 km
C24 km
D18 km
Answer & Solution
Correct answer: A. 20 km
d/30 - d/40 = 10 min = 1/6 h-ৰ পৰা পোৱা যায় d/120 = 1/6, গতিকে d = 20 km।
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