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From A to B, 3 hours at speed S for a distance of 3S km.

From B to A, 2 hours at speed (S + 25) for a distance of 2(S + 25) = 2S + 50

Distance is same…

3S = 2S + 50

S = 50 km/h

(a) From A to B, speed -> 50 km/h

(b) Distance -> 50 × 3 = 150 km

1 Reply 1 Like ✔Accepted Answer

Thank u so much. I knew it must be a simple solution but I just couldn’t figure it out. How exasperating! Wonder if there is any tips I can master it. 

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