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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

Jitender Pal , 11 Years ago
Grade 9
anser 3 Answers
jhansi adapaka

Last Activity: 11 Years ago

it take aproximately 4 hours 40 min

Murtaza Khanjiwala

Last Activity: 11 Years ago

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.

raj

Last Activity: 6 Years ago

increasing speed in 2 hrs= 10km/hr
‘’                  ‘’      ‘’    1 hr= 5 km/hr 
 
extended speed = 70+5=75 km/hr 
time required= (345/75) = 4.6 hr

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