Question

Find the speed in each case:
a. Atrain covers 300 km in 4 hou
b. A boy walks 8 km in 2 hours.​

Answer 1

Step-by-step explanation:

a)We have,

Distance covered =300 km

Let, the speed of the train =x km

∴t1=x300....(1)

Distance=300 km

Speed=(x−10)km

∴t2=(x−10)300....(2)

Given eqn (1)−(2)=1 hr

∴(x−10)300−x300=1

(x−10)x[300x−300(x−10)]=1

300x−300x+3000=(x−10)x

3000=(x−10)x

Let, x=60

∴3000=(60−10)60

Therefore speed of the train (x)=60 km/hr

Answer 2

Answer:

1. 75km/h and 4km/h

Step-by-step explanation:

speed = distance /time

1. 300/4=75
2. 8/2=4