A long belt is moving horizontally with a speed of 5 km/h. A child is running on belt to and fro with a speed of 9 km/h with respect to belt between his father and mother located 50 m apart on the belt. For an observer on a stationary platform outside, what is the
speed of the child running opposite to the direction of the belt ?

Explanation

To solve the problem, we need to determine the speed of the child running opposite to the direction of the belt as observed by a stationary observer. Here’s a step-by-step solution:

### Step 1: Understand the given information
- The speed of the belt (V_b) = 5 km/h (moving in a horizontal direction).
- The speed of the child with respect to the belt (V_c) = 9 km/h.
- The child runs to and fro between his father and mother, who are 50 m apart on the belt.

### Step 2: Determine the speed of the child running in the same direction as the belt
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