Question

Myra drove at an average speed of 30 km/hour for 2 hours and then at an average speed of 60 km/hr for the next 2 hours. If she made no stops during the trip and reached her destination in 4 hours, what was her average speed in km per hour TD for the entire trip?


majak na kro please mai dar jaani aa yaar​

Answer 1

MARK ME AS BRAINLIEST

Explanation:

Let the total distance be 1. The distance covered on 30mph= x; so the distance covered on 60 will be 1-x

<--------------------------------|---------->

X (1-x)

Equating times,

x/30 + 1-x/60 = 1/50;

Solving we get, X= 1/5.= so distance covered at 30mph=1/5 and distance covered at 60mph=4/5

Time calculation,

Time taken to cover 1/5 jounery at 30mph= 1/150.

Total time taken for the entire jouney= 1/50.

Fraction of the time.

1/150/1/50 = 1/3 (option B).

Answer 2

Explanation:

total distance travelled by myra in 4 hours =30*2+60*2=180km

the average speed for entire trip,

V=total distance covered/total time taken

V=180/4=45km/hr

hence average speed for entire trip is 45 km/hr