Question

Distance from A to B  =  200 miles, 
Distance from B to C  =  300 miles,
Distance from C to D  =  540 miles
The speed from B to C is 50% more than A to B. The speed from C to D is 50% more than B to C. If the speed from A to B is 40 miles per hour,  find the average speed from A to D. 

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Answer 1

SOLUTION:-

•Step:1

Speed ( from A to B )  =  40 miles/hour

Speed ( from B to C )  =  60 miles/hour  (50% more)

Speed ( from C to D )  =  90 miles/hour  (50% more)

•Step:2

Formula to find time is 

=  Distance / Time 

Time (A to B)  =  200 / 40  =  5 hours

Time (B to C)  =  300 / 60  =  5 hours

Time (C to D)  =  540 / 90  =  6 hours

Total time taken from A to D is

=  5 + 5 + 6  

=  16 hours

Total distance from A to D is 

=  200 + 300 + 540  

=  1040 miles

•Step:3

Formula to find average speed is

=  Total distance / Total time 

=  1040 / 16

=  65

So, the average speed from A to D is 65 miles per hour.

Answer 2

Answer:

The Answer is 65 miles per hour.

Step-by-step explanation:

Step 1

Given :-

Speed ( from A to B ) = 40 miles per hour

Speed ( from B to C ) = 60 miles per hour (50% more)

Speed ( from C to D ) = 90 miles per hour (50% more)

Step 2 :

Formula to find time = distance/time

Time (A to B) = 200 / 40 = 5 hours

Time (B to C) = 300 / 60 = 5 hours

Time (C to D) = 540 / 90 = 6 hours

Total time from A to D = 5+5+6= 16hrs

Total distance from A to D=200+300+540=1040

Final step :

Vav= Total distance/total time

=. 1040/16=65 miles per hour

I hope this will help you .