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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Let.....x be required distance. x/s=t........... now by 1 st condition... x/25=t+1/15...................................( 4 minutes=1/15 hours) and by second equation x/30=t-1/6 from above equations, x/25 -1/15=x/30 +1/6 so x=35 km ans is 35 km

Let distance be x km Time taken to reach office at 25kmph=(x/25)*60 minutes Time taken to reach office at 30kmph =(x/30)*60 minute As per question (x/25)*60-4=(x/30)*60 +10 ⇒ (60x-100)/25= 2x+10 ⇒ 60x -100 = 50x + 250 ⇒ 10x=350 x=35 km