The paper investigates the effect of Assamese L1 in native Assamese speakers speaking Hindi as an L2 in terms of speech rate and rhythm metrics in various sociolinguistic contexts. While Hindi is a syllable-timed language, the rhythm in Assamese varieties is reported to be akin to Japanese, which is a mora-timed language. We investigate spontaneous Hindi speech produced by 75 native Assamese speakers. A total of 4645 breath groups are analyzed for speech rate and rhythm using measures like syllable per second, segment per second, %V, nPVI, rPVI, VarCo-V, VarCo-C, DeltaV, and DeltaC. Assamese accented Hindi spontaneous speech data is compared with Hindi and Assamese read speech data and further grouped into age, gender, rural/urban area, and dialect. All these groups appear to show rhythmicity similar to Assamese read speech indicating L1 influence on L2 rhythm. Age and gender effects on rhythm measures are observed.