Question : A car can finish a certain journey in 10 hours at a speed of 42 km/hr. In order to cover the same distance in 7 hours, the speed of the car (km/hr) must be increased by:
Option 1: 12 km/hr
Option 2: 15 km/hr
Option 3: 18 km/hr
Option 4: 24 km/hr
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Correct Answer: 18 km/hr
Solution :
A car can finish the journey in 10 hours at a speed of 42 km/hr.
Total distance of journey = 42 × 10 = 420 km
Required speed to cover this distance in 7 hours = $\frac{420}{7}$ = 60 km/hr
So, the speed must be increased by = (60 – 42) = 18 km/hr
Hence, the correct answer is 18 km/hr.
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