Question

42. A ship moves due east with a speed of 40m/h
for 1hour and then moves due north with a speed
of 30m/h for another 1hour calculate its average
speed.
Ans-35m/h
B
C​

Answer 1

Answer:

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White blood cells protect us against illness and disease.

White blood cells are as our immunity cells. In a sense, they are always at war.

They flow through your bloodstream to fight viruses, bacteria, and other foreign invaders that threaten your health.