Question

a train started at 7 pm and reached its destination at 9 pm and its average speed during the journey was 85 km/h.how fast was the train moving at 8 pm?​

Answer 1

Correct option is

C

19 min

Let the correct time for the train to complete the journey is x minuets

Then train cover distance in x+11 minuets at speed 40 km\hr =

60

40(x+11)

km

Then train cover distance in x+5 minuets at speed 50 km\hr =

60

50(x+5)

km

Both are same then

60

40(x+11)

=

60

50(x+5)

∴40x+440=50x+250

∴−10x=−190

Answer 2

don't forget to do follow and thanks

Explanation:

overall we cannot say that what is the speed of the train but if enough information is not provide then we can take average speed as require speed