To find the time taken to cover a distance of 250m at speeds of 54 km/hr and 36 km/hr, we can use the formula:

(S = V * t)

Where:
S = distance (in meters)
V = speed (in m/s)
t = time (in seconds)

First, we need to convert the speeds from km/hr to m/s:

Speed V1 = 54 km/hr = (54 \times \frac{1000}{3600}) m/s = 15 m/s
Speed V2 = 36 km/hr = (36 \times \frac{1000}{3600}) m/s = 10 m/s

Now, we can calculate the time taken for each speed to cover a distance of 250m:

For V1:
(250 = 15 \times t)
(t = \frac{250}{15} = 16.67) seconds

For V2:
(250 = 10 \times t)
(t = \frac{250}{10} = 25) seconds

Therefore, the time taken to cover a distance of 250m at a speed of 54 km/hr is approximately 16.67 seconds and at a speed of 36 km/hr is 25 seconds.