Question

a train runs at a speed of 36km per hour for 15minutes at 72kmper hour for 10 minutes and at 18kmper hour for 5 minutes.calculate the average speed of the train​

Answer 1

Answer:

Given train travels 12 minutes with speed 30 km \hr

Then train travels =

60

30

×12=6km

And train travels 8 minutes with speed 45 km\ hr

Then train travels =

60

45

×8=6km

Then train travels distance in 12+8=20 minutes =6+6=12 km

Then average speed =

20

12

×60=36 km \hr