Math Help - Avarage speed

The bus had to stop for 16 minutes. To arrive in time to the bus station according to the timetable the bus had to drive faster than it was intended. So the bus driver was driving the distance 80 kilometers 10 km/h faster to arrive in time. How much was the average speed if the bus driver wasn't stop for 16 minutes.

The answer is 50 km/h. How ?

Originally Posted by totalnewbie

The bus had to stop for 16 minutes. To arrive in time to the bus station according to the timetable the bus had to drive faster than it was intended. So the bus driver was driving the distance 80 kilometers 10 km/h faster to arrive in time. How much was the average speed if the bus driver wasn't stop for 16 minutes.

The answer is 50 km/h. How ?

I attached the answer for your reference.