allery40 કિમી/કલાકની ઝડપે એક સફર 1 કલાક મોડી સમાપ્ત થાય છે; 60 કિમી/કલાકની ઝડપે, 1 કલાક વહેલો. સુનિશ્ચિત સમયગાળો?
A6 કલાક
B5 કલાક
C3 કલાક
D4 કલાક
Answer & Solution
Correct answer: B. 5 કલાક
અંતર d માટે, d/40 − d/60 = 2 d = 240 કિમી આપે છે, તેથી સુનિશ્ચિત સમયગાળો 240 ÷ 40 − 1 = 5 કલાક છે.
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