A car travels along a straight line for first half time with speed 40 km/h and
second half time with speed 60 km/h, the mean speed of the car is
a 45 kmh 250 km/h 352,5 km/h 4)55 km/h
plz ans fast
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Let assume total time = t and total distance = 2d
for 1st half,
v = 40km/h
s1 = d
t1 = d/40
similarly for 2nd half
v=60km/h
s2 = d
t2 = d/ 60
Mean speed = Total distance/ Total time
= 2d / t1 + t2
= 2d/ d/40 +d/60
= 2d / d(1/40+1/60)
= 2× 250/ 10
= 48km/h
tamreensultana17:
Option 48 is not given
Ikr I did this numerical before and the ans was 48
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