Sridhar can cover a certain distance in 144 min. by covering two-third of the distance at 4 kmph and the rest at 5 kmph. Find the total distance.

3 km.

4 km.

6 km.

8 km.

Solution: Let the total distance be x km. then, (2x/3)/4 + (x/3)/5 = 7/5 => x/6 + x/15 = 7/5 => 7x = 42 => x= 6.

how 144min=7/5

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