Question

A car
ir travels X km at 60 kmph and then travels another 2X kms at 40 kmph. Find its average speed
over the entire distance
151
a) 45 kmph
c) 50 kmph
d) 56 kmph
me will the train take to
b) 48 kmph​

Answer 1

Step-by-step explanation:

Time in case 1 = x/60 hrs

Time in case 2 = 2x/40 = x/20 hrs

Total time = x/60 + x/20 = x/15 hrs

Total distance = x+2x = 3x km

Average speed = total distance/ total time = (3x)/(x/15) = 45 kmph

So the answer is option A.

Answer 2

Answer:

case 1

d = x

s = 60 km/h

t = d/s

= x/60 h

case 2

d = 2x

s = 40 km/h

t = d/s

= 2x/40

= x/20

total distance = 3x km

total time = x/15 km/h

average speed = d/t

= 3x×15/x

= 45 km/h

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