Question

Riya and Tanya were assigned two exhibition stalls such that the distances from their homes are 36 km and 48 km respectively. They both left their house at the same time and reached their stalls by 9
A.M. One day the stalls were switched, and Riya started 20 minutes earlier than Tanya to reach her new stall on time. Find the speed of Riya.

A 55 km/h
B 45 km/h
C 36 km/h
D 65 km/h
E None of these
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