1.

th theTwo cars are moving in the same direction wisame speed of 30 km/hr. They are separated by adistance of 5 km. A truck moving in the oppositedirection meets these two cars at an interval of4 minute. The speed of the truck is(1) 30 km/hr(3) 75 km/hr19.(2) 45 km/hr(4) 60 km/hr

Answer»

Here we will apply relative conceptlet the speed of the car isu then relative speed of car with respect to car c is (u+30)

Distance is 5 kilometres

Time is 4minutes= 4÷ 60 hours

Speed= distance/ time

U+30= 5/4/60

U+30=5×60/4

On solving above equation we get

U+30 = 75 then u= 75 - 30= 45 km/h



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