A boy is late by 9 minutes, If he walks to school at a speed of 4 km / hour. If he walks at the rate of 5 km/ hour, he arrives 9 minutes early. The distance to his school is
A boy is late by 9 minutes, If he walks to school at a speed of 4 km / hour. If he walks at the rate of 5 km/ hour, he arrives 9 minutes early. The distance to his school is 1). 9 km 2). 5 km 3). 4 km 4). 6 km