Question

a person drives a car with a speed of 69 km per hour and reaches his destination in 4 hour . If he decides to reaches in 3 hours , what should be the speed ?​

Answer 1

Answer:

Step-by-step explanation:

Velocity=distance/time

He reached the distance in 4hrs with speed 69km/hr

then V=d/t

69=d/4

d=276km

So to cover distance in 3hrs his speed must be V=d/t

=276/3

V=92km/hr

Answer 2

As we know the formula

V=d/t

So,

1hour=60×60=3600seconds

speed =V1=69kmh-¹=69×1000/3600ms-¹

v=69000/3600ms-¹

time=t=4h=4×3600

t=14400seconds

so ,

v1=d/t

d=v×t

d=69000×4×3600/3600

d=286000m=286Km

So,

V2=d/t

t=3×3600seconds

V2=286000/3×3600

V2=26.481ms-¹

converting ms-¹ into Kmh-¹

V2=26.481×3600/1000kmh-¹

V2=95kmh-¹