A motorist travels for 3 hours at a certain speed and then increase his speed by 10 km for the next 4 hours If he travels 335 km altogether, Find his speed for the First 3 hours

See the answer below.

Step-by-step explanation:

We know that:  

So, using the given data, we can write an equation for the total distance travelled as:

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step-by-step explanation:

the answer is 13

step-by-step explanation:

5*5=25

12*12=144

25+144=169

169^2=13