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Question 95
Two cars A and B travel from one city to another, at speeds of 72 km/hr and 90 km/hr respectively. If car B takes 1 hour lesser than car A for the journey, then what is the distance (in km) between the two cities?
Solution
Both travel same distance and so distance =speed*time
time taken by B is t hours
72(t+1)=90t
72t+72=90t
18t=72
t=72/18
=4 hours
Distance=90*4
=360 kilometers
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