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A car covers 150 km in 3 hours. What is its speed?
40 km/hr
50 km/hr
60 km/hr
45 km/hr
50 km/hr
Use the rule of zeros: divide 15 by 3 to get 5, then simply append the remaining zero to get 50.
Distance (d) = 150 km, Time (t) = 3 hours.
Speed=TimeDistanceтАЛ
Use the rule of zeros: divide 15 by 3 to get 5, then simply append the remaining zero to get 50.
Students often accidentally invert the formula as Time divided by Distance, leading to an incorrect result of 0.02.
Identify Given Values
We are given the total distance d=150 km and the time taken t=3 hours.
d=150,t=3
Apply Speed Formula
The formula for speed is defined as the distance traveled per unit time.
Speed=3┬аhours150┬аkmтАЛ
Calculate Result
Dividing 150 by 3 yields 50. Therefore, the speed is 50 km/hr.
Speed=50┬аkm/hr
B is correct because the quotient of 150 divided by 3 is exactly 50 km/hr.
This concept forms the base for 'Relative Speed' problems in train and boat-stream questions; always ensure distance and time units are consistent before calculating.
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