Ivy is competing in a 400 m race. She runs at a constant speed of 5.4 m/s for the first 150 m, then 4.5 m/s for 40 seconds.
The remainder of the race takes her 34 seconds to complete.
What is Ivy's average speed for the entire race to 1 dp?

Average speed = 3.9 m /s

Step-by-step explanation:

Total distance = 400m

First 150m = 5.4m/s

Second part :

S = 4.5m/s for 40s

Third part :

Remaining distance = 400 - 150 -180 = 70m

Time taken to cover it = 34s

Speed = 2.05m/s

Find average speed

Round to 1 dp => average speed = 3.9m /s

step-by-step explanation:

[2, 2.5)

(2.5, 3]

step-by-step explanation:

i think its these two not sure [2, 2.5)

(2.5, 3]