Question

Rohan took 4 hrs to complete 1/4 part of a journey at an average speed of 55 km/hr. his average speed for the whole journey is 60 km/hr. how long will it take to cover the first 3/4 part of the journey ?​

Answer 1

Answer:

3*880/4

Step-by-step explanation:

Let the total distance covered is x

In 4 hours the distance covered is x/4 at an average speed of 55km/hour

Average speed=distance/ time

55=x/4/4

x=55*4*4

x=880 km

Thus total distance to covered is 880 km

Now the total distance to be covered at an average speed of 60km/h

Thus average speed= distance/time

60=880/time

Time=880/60=14.66 hours

In 14.66 hours, total distance of 880 km is covered

But actually 4 hours is already consumed in 880/4 distance traveled

Thus 10.66hours is required to covered the remaining distance of 3*880/4