The bus departs from the bus station of city A to port B at 9 am at a speed of 80 km / h and arrives at the port at 3 pm

The bus departs from the bus station of city A to port B at 9 am at a speed of 80 km / h and arrives at the port at 3 pm. During the movement, the bus made 5 stops of 12 minutes each. What time do you need to leave by car to arrive at port B at the same time as the bus? The speed of the bus is 20 km / h less than the speed of the car. The car goes the same way. as the bus from A to B, but moves without stops.

Let’s calculate how much time the bus spends on the whole trip:

15 – 9 = 6 hours – spends the bus for the whole trip.

Let’s calculate how much time the bus spends on stops:

5 * 12 = 60 minutes = 1 hour – the bus spends at stops.

Let’s calculate how much time the bus spends on a trip without stops:

6 – 1 = 5 hours – spends the bus on a trip without stops.

Let’s calculate the distance from the city to the port:

5 * 80 = 400 km – the distance from the city to the port.

Let’s calculate the speed of the car:

80 + 20 = 100 km / h – vehicle speed.

Let’s calculate how much time the car will spend on the whole trip:

400: 100 = 4 hours – the car will spend on the whole trip.

Let’s calculate at what time you need to leave by car in order to arrive at the port at the same time as the bus:

15 – 4 = 11 h – you need to leave by car.

Answer: at 11 o’clock in the morning.