allery30 km/h ବେଗରେ ଗଲେ ଜଣେ ଛାତ୍ର ବିଦ୍ୟାଳୟରେ 5 minutes ବିଳମ୍ବରେ ପହଞ୍ଚନ୍ତି ଏବଂ 40 km/h ବେଗରେ ଗଲେ 5 minutes ପୂର୍ବରୁ ପହଞ୍ଚନ୍ତି। ବିଦ୍ୟାଳୟଟି କେତେ ଦୂରରେ ଅବସ୍ଥିତ?
A20 km
B25 km
C24 km
D18 km
Answer & Solution
Correct answer: A. 20 km
d/30 - d/40 = 10 min = 1/6 h ରୁ ମିଳେ d/120 = 1/6, ତେଣୁ d = 20 km।
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