a girl is peading her bicycle at a speed of 4kmph .how far will she travel in 3 hours
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Answers
Answer:
Think of it this way: The rate tells us that, in every hour, the girl travels 40km. (She should definitely train to be professional cyclist, by the way ... I'm pretty serious about my cycling but I cannot keep up with this girl.) So: 1 hour, 40km. But she travels for 3 hours, and in each of those three hours she goes 40km. 40km for the first hour, 40km for the second, 40km for the third ... 3 * 40km = 120km.
The general form is: rate of X units per unit time, done for Y units of time, so Y*X units overall.
A key thing to check before applying this standard approach is that the time units are the same in the rate and in the total time. Suppose now this girl is cycling for 30 minutes, instead of 3 hours. (If she lives on a big hill, she might be able to maintain 40km/hr on a steep enough descent.) You can't multiply 30 minutes * 40 km/hr, because minutes are not the same as hours. You need to either convert the total time to hours, or convert the rate to km/minute, so that the units match. Since 30 minutes is 1/2 hour, we get 1/2 hr * 30 km/hr, and 1/2 of 30 is 15, so 15km.
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Answer:
the answer is 12 km
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