Neel and Ishan are brothers. They left their home at the same time and drove to the same stadium. Neel drove at a speed of 30 km per hour. Ishan drove at a speed of 20 km per hour. Neel arrived at the stadium 0.5 hour earlier than Ishan. What is the distance between their home and the stadium?

Answer: C. 30 km

Every hour, Neel gets ahead of Ishan 30-20=10 km. When Neel arrived at the stadium, Ishan is only 20 x 0.5 =10 km behind. That tells us they only drove 1 hour when Neel arrived at the stadium. The distance between their home and the stadium is Neel's speed x Neel's time. = 30 x 1 = 30 km

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