Sol. c) 1080

Since Ramu takes 2 minutes to only set up the order, the time taken to travel the distance is 15 minutes.

Now,the path either goes uphill or downhill, so let x be the distance covered uphill and y be the distance covered downhill while travelling from the kitchen to the room. It should be noted that the distance traveled uphill while going to room is the distance traveled downhill on the way back and vice-versa.

So, the total time taken can be written as:

Thus, the total distance covered is 2(x+y) = 1080 m

Sol. a) 72

As calculated earlier, the total distance covered is 1080 meters in 15 mins, thus the average speed is 72 m/min.

Sol. a) 1:1

As seen earlier, the distance traveled uphill in one direction, becomes downhill while coming back and vice-versa. So, the ratio of the distances is 1:1.