A train traveling at 100 km an hour takes 3 seconds to enter a tunnel and an additional thirty seconds to pass completely through it. Find the length, in kilometers, of the train. Express your answer as a common fraction

Length of the train=1/12 km

Step-by-step explanation:

The train took 3 seconds to disappear into the tunnel travelling at 100 km/h

It means, the train travelled its length in 3 seconds.

Length of the train can be calculated thus

Length of the train=speed ×time

=100km/hr * 3/3600

=300 / 3600

=30 / 360

= 1 / 12 km

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1