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CBSE Class 11-science Answered

two cars are moving in the same direction with a speed of 30 km/h. they are seperated from each other by a 5 km. third car moving in the opposite direction meet the two cars after an interval of 4 minutes.find the speed of the third car.
Asked by Sayoni Maiti | 04 Jun, 2014, 10:27: AM
answered-by-expert Expert Answer
The relative speed between the two cars is zero as both are moving with same speed i.e. 30 km/h.
The third car meets the two cars in the time gap of 4 minutes.
This problem can be solved using relative motion concept.
Considering the two cars at rest.
Let the relative speed of the third car be x with respect to the two cars.
The relative displacement by the third car during the time interval of 4 minutes = 5 km.
Therefore x = Syntax error from line 1 column 49 to line 1 column 72. Unexpected '<mstyle '.
Hence velocity of third car with respect to two cars is 75 km/h
but the two cars are travelling in opposite direction to that of the third car at a speed of 30 km/h
Therefore actual speed of the third car = 75 - 30 = 45 km/h
Answered by Ravindra Kapal | 04 Jun, 2014, 04:44: PM
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