Question

A train is moving with a speed of 80 miles per hour for the first 4 hours and 110 miles per hour for the next 3 hours. Find the average speed of the train using the average speed formula.

Answer 1

It is given that the train is moving at a speed of 80 miles per hour for the first 4 hours.
Here S₁ = 80 and T₁ = 4.
And the train is moving at a speed of 110 miles per hour for the next 3 hours.
Hence S₂ = 110 and T₂ = 3.
Average Speed Formula = $\frac{S_1\times T_1+S_2\times T_2}{T_1+T_2}$
=Average Speed = (80 × 4 + 110 × 3) ÷ (4 + 3)
= (650) ÷ (7) = 92.86 miles/hour