Question

A train travels 40 km with a uniform speed of 30 km/h.. it's average speed for the whole journey after covering another 40 km is 45 km/h .. what is it's speed in the second half of the journey??​

Answer 1

Answer:

45km/h=40+40/ 40/30+40/x

45=80/4/3+40/x

45=80/4x+120/3x

45=80×3x/4x+120

45=240x/4x+120

45(4x+120)=240x

180x+5400=240x

5400=240x-180x

5400=60x

5400/60=x

90=x

speed for next half of journey =90km/h

@:-)

Step-by-step explanation:

Answer 2

Answer:

what is your questions bro about it