A car covers a certain distance moving at a constant speed of 50 km/h in 3 hours. How much more time would it have taken to cover the same distance if the speed had been only 40 km/h?
As we know,Â
Distance =Â $$Speed\times\ time$$
given, Speed = 50km/hr , Time = 3 hr = 180 min (1hr = 60 min)
Distance =Â $$50\times\ 3=150\ km$$
If speed is 40 km/hr , now time taken,Â
Using same formula,Â
$$time\ =\ \frac{dis\tan ce}{speed}$$
=Â $$\frac{50}{40}=3.75\ $$ = 225 min
Required time difference = 225 - 180 = 45 min
Hence. Option B is correct.
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