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A motor car starts with the speed of 70 km/hr with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms?
[A] 2 (1/4) hrs
[E] None of these
[C] 4(1/2) hrs
[B] 4 hrs 5 min
[D] Can not be determined
it take aproximately 4 hours 40 min
V-U=at
10=a(2)
a=5
S=ut+at2/2
s=(70)t+(5)t2/2
69=(14)t+t^2/2
0=t2+28t-138
solving this eqn we get t=4.27hrs.
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