3. Two drivers A and B were driving cars on a road. There was a sign board on the side of road reading "speed limit 45 km/h Driver A applied brakes and started driving at 45 km/h. On the other hand, Driver B did not bother about the speed limit. He continued to drive his car at 70 km/h. Why are these speed limits set at certain locations? which device is fitted in automobile to measure their speeds? Mention a meaningful slogan to spread awareness in the society regarding rash driver
Answers
Explanation:
There was a sign board on the side of road reading "speed limit 45 km/h Driver A applied brakes and started driving at 45 km/h. On the other hand, Driver B did not bother about the speed limit. He continued to drive his car at 70 km/h. Why are these speed limits set at certain locations? which device is fitted in automobile to measure their speeds? Mention a
Answer:
A and B each have a certain number of mangoes. A says to B, "if you give 30 of your mangoes, I will have twice as many as left with you." B replies "if you give me 10, I will have thrice as many as left with you." How many mangoes does each have?
Let the number of mangoes A has, be x
and the number of mangoes B has , be y .
∴30+x=2(y−30)⟶(i) ,as A says
and , 10+y=3(x−10)⟶(ii) ,as B says
On simplification ,
x−2y+90=0⟶(iii)
−6x+2y+80=0⟶(iv)
On adding (iii) and (iv),
−5x+170=0
⇒x=34 mangoes.
putting x in (i),
34−2y+90=0
2y=124
y=62 mangoes.