allery30 km/h ની ઝડપે એક વિદ્યાર્થી શાળાએ 5 મિનિટ મોડો પહોંચે છે અને 40 km/h ની ઝડપે 5 મિનિટ વહેલો પહોંચે છે. શાળા કેટલી દૂર છે?
A20 km
B25 km
C24 km
D18 km
Answer & Solution
Correct answer: A. 20 km
d/30 - d/40 = 10 મિનિટ = 1/6 કલાક પરથી d/120 = 1/6 મળે છે, તેથી d = 20 km.
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