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Going for a long trip, Thomas drove for 2 hours and had lunch. After lunch he drove for 3 more hours at a speed that is 20 km/hour more than before lunch.

100km/h Take initial speed as x. Distance travelled = speed * time taken " = x*2 =2x Speed after lunch=x+20 Dt=(x+20)*3 =3x+20 Total distance=2x+3x+60 5x=400 x=80 X+20=100