Question

A motor car travels 175 km distance from a place A to B,at a uniform speed 70km/hr passes though all ten green traffic signals.Due to heavy traffic it stops for 1 minute at first signal,3 minute at second signal,5 minute at third signal and so on stops for 19 minutseat tenth signal.How much total time it takes to reach at the place B.Solve by suitable mathematical method.

Answer 1

well,

S10 = 10/2 (1+19)

Answer 2

31÷6

Answer 3

Answer

Answer 4

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