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Q.
Mr. Karthik drives to work at an average speed of 48 km/hr. Time taken to cover the first 60% of the distance is 20 minutes more than the time taken to cover the remaining distance. Then how far is his office ?
A.
40 km
B.
50 km
C.
70 km
D.
80 km
View Answer
Correct choice: D
Explanation:
Let the total distance be 'x' km. Time taken to cover remaining 40% of x distance is t1=40×x / 100×48 But given time taken to cover first 60% of x distance is t2=t1+20/60hrs t2=60×x/100×48 ∴60×x/100×48= 40×x/100×48+20/60 x=80 km.
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