A boy stated from his house on bicycle at 10 am at a speed of 12 km per hour. His elder brother started after 1 hr 15 min on scooter along the same path and caught him at 1.30 pm. The speed of the scooter will be (in km/hr) ?
4.5 km/hr
36 km/hr
\(18\frac{2}{3}\) km/hr
9 km/hr
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