Explanation: The phrasing "no less than 35" means t = 35 is the lowest t can go. So we have t = 35 or t is larger than this. That leads directly to the inequality mentioned above, which is t is greater than or equal to 35. Another way to think of it is to say "t is 35 or larger".
when dina arrived to 20 masha was at 16. so the relation is 20/16 and if dina's speed was 10 your formula is 10/x=20/16 that means x/10=16/20. so x will be 8