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A is driving a car along the highway at a speed of 90 km/hr. B, driving a car at a constant speed on the same highway and in the same direction, crossed it. After 12 seconds, B has crossed A, and the distance between their cars is 100 meters. The speed (in km/h) of B's car is:
  • a)
    110
  • b)
    115
  • c)
    120
  • d)
    125
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A is driving a car along the highway at a speed of 90 km/hr. B, drivi...
Given:
A is driving a car along the highway at a speed of 90 km/hr.
B, driving a car at a constant speed in the same direction.
After 12 seconds, B has crossed A, and the distance between their cars is 100 meters.
Formula used:
Convertion of kmph to mps = 1 × 5/18
Speed = distance / time
Calculations:
(x - 90) × 5/18 = 100/12 (where, x is the constant speed of B)
⇒ (x - 90) × 1/6 = 5
⇒ (x - 90) = 30
⇒ x = 90 + 30 = 120
∴ The answer is 120 kmph
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A is driving a car along the highway at a speed of 90 km/hr. B, driving a car at a constant speed on the same highway and in the same direction, crossed it. After 12 seconds, B has crossed A, and the distance between their cars is 100 meters. The speed (in km/h) of B's car is:a)110b)115c)120d)125Correct answer is option 'C'. Can you explain this answer?
Question Description
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