Question

find average speed
if...
distance=2km
Time=1hr10min
please answer this​

Answer 1

Formula: Speed = Distance/ Time, Therefore, Time = Distance / speed

Given that speed of the car is 20km/hr more than the average speed of the bus, Let the speed of the bus be x,

Therefore speed of the car is x+20.

Average speed of the bus:

300/x - 4=300/x+20

=> 300[x+20-x/x(x+20)]= 4

=> 300(20/ x(x+20)) = 4

=> 300(20/x²+20x) = 4 (upon cross multiplying)

=> 6000= 4x²+80x

4x²+80x-6000=0

4(x² + 20x -1500) =0

x²+20x-1500=0

Upon factorizing,

(x+50)(x-30)=0

I hope it will helpfull for you

Answer 2

Answer:

1.714 km/h

Explanation:

We know that :

$Average$ $Speed=\frac{Total}{Total}$$\frac{Distance}{Time}$

Total Distance = 2km

Total time = 70 mins

Average speed = 2km/1.1667 = 1.714 km/h