alleryકારની ઝડપમાં 5 km/h નો વધારો કરવાથી તે 60 km નો રસ્તો 1 કલાક વહેલો પૂરો કરે છે. તેની મૂળ ઝડપ કેટલી હતી?
A12 km/h
B15 km/h
C10 km/h
D20 km/h
Answer & Solution
Correct answer: B. 15 km/h
60/s - 60/(s+5) = 1 પરથી s(s+5) = 300 મળે છે, તેથી s = 15 km/h.
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