Question

if Vaishali goes to the school from house at speed of 40 km/hr and reaches in 8 min.find the time of reaching to school from house if she Moves at speed of 36km/hr​

Answer 1

Answer:

As speed = DIST / TIME

Let x be the time of her school so by equation

4kmph = DIST / (x+5)

I.e 4(x+5) = d …….(1)

As she was late 5 mins hence x+5

For 2nd case

6 KMPH= DIST / (x-10)

I.e 6(x-10)=d……(2)

As LHS are equal , hence

4(x+5)=6(x-10)

4x+20=6x-60

80=2x

X= 40

Step-by-step explanation:

Mark as brainlist answer

Answer 2

Answer:

In one hour she can go 40 km

Now in one MINIUTE she can go (40/60)

=0.667 Km

• So in 8min. she can go(0.667Multiplied by 8) =5.336 km

• Now its took 36 km/hour

she takes 1 hour to reahed 36 km

or (36divided by 60)= 0.6 km/min

we can say that she takes 1minitue to complete 0.6 km so to complete 5.336 km she may take(5.336 devided by 0.6)

and the answer is 8.8934 minitue

so the time which is nedded is 8.8934min