alleryએક છોકરો 5 km/h ની ઝડપે ચાલે તો 6 મિનિટ મોડો પહોંચે છે, પરંતુ 6 km/h ની ઝડપે તે 6 મિનિટ વહેલો પહોંચે છે. તેનું ગંતવ્ય સ્થાન કેટલું દૂર છે?
A4 km
B6 km
C8 km
D5 km
Answer & Solution
Correct answer: B. 6 km
d/5 - d/6 = 12 મિનિટ = 0.2 કલાક પરથી d/30 = 0.2 મળે છે, તેથી d = 6 km.
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