A train moving at speed of 80 km/hr crosses a pole in 7 seconds. Find the length of the train.(A) 185 m(B) 152 m(C) 180 m(D) 175 m
Question
A train moving at speed of 80 km/hr crosses a pole in 7 seconds. Find the length of the train.(A) 185 m(B) 152 m(C) 180 m(D) 175 m
Solution
To solve this problem, we need to use the formula for speed, which is distance/time.
Step 1: Convert the speed from km/hr to m/s. We know that 1 km = 1000 m and 1 hr = 3600 s. So, 80 km/hr = 80 * 1000 m / 3600 s = 22.22 m/s.
Step 2: Use the formula for speed to find the distance, which in this case is the length of the train. The train crosses a pole in 7 seconds, so the time is 7 seconds.
Step 3: Substitute the values into the formula: distance = speed * time = 22.22 m/s * 7 s = 155.54 m.
So, the length of the train is approximately 155.54 m. The closest answer to this is (B) 152 m.
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