Question

a person drives a car at certain speed if increases his speed by 4 kilometre per hour it takes 30 minutes less to reach your destination if it decreases his speed by 2 kilometre per hour that he takes 20 minutes extra to reach the destination what is the distance covered by him​

Answer 1

Answer:

60 km. imp.

Step-by-step explanation:

d1 = d 2

s(s+ - a1)×t1/a1 = s(s + - a2)×t2/a2

a1 ,a2 = change in speed

t1,t2 = change in time

s(s+4)×30/60/4 = s(s-2)* 20/60/2

(s+4)/8 = (s-2)/6

6s + 24 = 8s - 16 => 2s = 40

So s = 20 km/h

distance = 20(20 -2)× 20/60/2

= 20 × 18 /6 = 60 km