Question

when the sand crossed a quarter of his street and another 5km, he had a third of the street and another 10km left by the end of the street what is the length of the street​

Answer 1

Answer:

Let r be the speed of first train.

And r+5 be the speed of other train.

The distance first train travels in 2 hours is =2r

The distance other train travels in 2 hours is (r+5)×2=2(r+5)

Now we know that the distance the first train travels (2r) plus the distance the other train travels 2(r+5) equals 340−30=310.

So, 2r+2(r+5)=310

⇒2r+2r+10=310

⇒4r=300

⇒r=75

Thus, speed of first train is 75 mph.

Therefore, the speed of other train is r+5=75+5=80 mph.