Question

for traveling a distance of 160km, a train travels at a speed of 80km/hr .for 120 kms and the rest at 40km/hr .find average speed​

Answer 1

Answer:

Average speed = 64 km per hour

Step-by-step explanation:

Speed = Distance / Time

Time = Distance / Speed

For first part of journey:

Speed = 80 km per hour

Distance = 120 km

Time = 120/80 = 1.5 hours

For second part of journey:

Speed = 40 km per hour

Distance = 40 km (obtained as 160 - 120)

Time = 40/40 = 1 hour

For total journey:

Distance = 160 km

Time = 1.5 + 1 = 2.5 hours

Speed = Distance/Time

           = 160/2.5

           = 64

Average speed is 64 km per hour