Question

a motor car travels 175 km distance from a place A to B at a uniform speed 70 km per hour passes though all the green traffic signals due to heavy traffic it is stops for 1 minutes at first Signal 3 minute at second signal 5 minute
at the signal and so on stop for 19 minute at tenth signal how much total time it takes to reach at the place be solved by suitable mathematical method

Answer 1

Time spent at signal 
10/2(1+19)=100min----1 
Speed = distance/time 
Let time =x hr 
70=175/x= 
X=175/70=2.5hr 
2.5hr =150min--2 
Total time =150+100 min=250min

Answer 2

speed is uniform ..

therefore time taken is 4 hrs 10 mins