Data Sufficiency (DS) | Re: Al, Pablo, and Marsha shared the driving on a 1,500-mile

HiBunuel ,

Many a times, only one equation is sufficient to solve the question as you mentioned in one of your posts. Even I observed the same.

statement 1+2(pablo has an speed of r and drives for t time)
Keeping this information in mind,

I tried to plugin the value in the below equation to find out if Pablo always have the highest speed, but I failed to do this within 2 mins. Is there a faster way to verify that it is not sufficient?
(t+1)(r-5)+tr=1050
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