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Answer» Question :- A car travels a distance d on a STRAIGHT road in two hours and then returns to the starting point in next three hours. What is the average SPEED. Given : A car travels a distance d on a straight road in two hours and then returns to the straight point in next three hours. To Find :- What is the average speed of a car. Formula Used :- Average Speed Formula :Solution :-First, we have to find the total distance travelled : A car travels a distance d on a straight road. Again, after TRAVELLING d distance its returns to the straight point. HENCE, the total distance travelled is :Now, again we have to find the total time TAKEN : A car travels a distance d on a straight road in 2 hours. Again, the time taken to return the car in a initial position is 3 hours. Hence, the total time taken is :Now, we have to find the average speed of a car :Given :Total distance travelled = 2dTotal time taken = 5 hoursAccording to the question by using the formula we get,Hence, the correct options is option no (b) 2d/5.

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