Moving at the rate of 70 km/hr, a car completes a journey in 18 mins. How long would it take to complete this journey,if the speed is increased to 84 km/hr?
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41
Answer:
15 minutes
Step-by-step explanation:
Speed = Distance / Time = 70km/hr
Time = 18 min = 18/60 hr
∴ Distance - Speed × Time = 70 × 18/60 = 7×3 = 21 km
Now, new speed = 84 km'hr
Distance will remain the same = 21 km
∴Time = Distance / Speed = 21/84 = 1/4 hr = 1/4 × 60 min = 15 min
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