A train traveled at the same speed for 84 hours. It went 3,510.2 miles in all. To the nearest tenth of a mile per hour, how fast was the train going?

Solution

A train traveled at the same speed for 84 hours. It went 3, 510.2 miles in all. To the nearest tenth of a mile per hour, how fast was the train going?

Solution

speed : 41.78809 \dots

Solution steps

Translate the problem into an equation:

3510.2 = x \cdot 84

Solve for

x, 3510.2 = x \cdot 84 : x = 41.78809 \dots

speed : 41.78809 \dots

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