If the speed of train is 150 miles per hour; then express its speed in si unit

200/3 = 66.67 m/s

1 mile = 1.60934 km

so 150 miles = appr 241.4 km

150 mph = 241 km/h

To express the speed of the train in SI units, we need to convert miles per hour to meters per second. Here's how you can do that:

1. Convert miles to meters: One mile is equal to 1609.34 meters. So, multiply the speed in miles per hour by 1609.34 to get the speed in meters per hour.

150 miles/hour * 1609.34 meters/mile = 241,401 meters/hour

2. Convert hours to seconds: One hour is equal to 3600 seconds. So, divide the speed in meters per hour by 3600 to get the speed in meters per second.

241,401 meters/hour / 3600 seconds/hour ≈ 67.06 meters/second

Therefore, the speed of the train in SI units is approximately 67.06 meters per second.

Answer is 400/3 m/s