Dina and masha start cycling on a 20 km bike path at the same time. when dina reaches the end of the path, masha still has 4 km of the path left to cycle. if dina's cycling speed is 10 km/h, how much time longer will masha need to complete the path?

0.5 hour

Step-by-step explanation:

Given

Speed of Dina = 10 km/h

Distance = 20 km

So the time Dina taken to complete the track is:

The time taken by Dina is 2 hours. As masha started with dina but she was 4 km of the path left to cycle,

her distance covered in 2 hours was:

So we know the time and distance:

Now,

We have to calculate the time that will be needed by MAsha to complete the track:

As we know the speed and remaining distance

Masha needs 0.5 hour to complete the track ..

b

step-by-step explanation:

start with a line segment pq that we will copy. mark a point r that will be one endpoint of the new line segment. set the compasses' point on the point p of the line segment to be copied. adjust the compasses' width to the point q. the compasses' width is now equal to the length of the line segment pq.

step-by-step explanation: