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ROUNAK from SARASWATI DEVI PUBLIC SCHOOL, KANDI
Subject :NSO    Class : Class 9

A boy runs for 10 minutes at a uniform speed of 9 km h-1. At what speed should he run for the next 20 minutes so that the average speed comes to 12 km h-1?

A 13.5 km h-1
B 10.2 km h-1
C 8.2 km h-1
D 7.72 km h-1


Give me Solution

Ans 1:

Sujata Samal from Alchemy school, Surat
Class : Class 8
somebody answer this

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